38fae2ed2702872414432600b6e744418a2c6e9d
[PrivacyBrowser.git] / app / src / main / java / com / stoutner / privacybrowser / activities / MainWebViewActivity.java
1 /*
2  * Copyright © 2015-2021 Soren Stoutner <soren@stoutner.com>.
3  *
4  * Download cookie code contributed 2017 Hendrik Knackstedt.  Copyright assigned to Soren Stoutner <soren@stoutner.com>.
5  *
6  * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
7  *
8  * Privacy Browser is free software: you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation, either version 3 of the License, or
11  * (at your option) any later version.
12  *
13  * Privacy Browser is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with Privacy Browser.  If not, see <http://www.gnu.org/licenses/>.
20  */
21
22 package com.stoutner.privacybrowser.activities;
23
24 import android.annotation.SuppressLint;
25 import android.app.Activity;
26 import android.app.Dialog;
27 import android.app.DownloadManager;
28 import android.app.SearchManager;
29 import android.content.ActivityNotFoundException;
30 import android.content.BroadcastReceiver;
31 import android.content.ClipData;
32 import android.content.ClipboardManager;
33 import android.content.Context;
34 import android.content.Intent;
35 import android.content.IntentFilter;
36 import android.content.SharedPreferences;
37 import android.content.pm.PackageManager;
38 import android.content.res.Configuration;
39 import android.database.Cursor;
40 import android.graphics.Bitmap;
41 import android.graphics.BitmapFactory;
42 import android.graphics.Typeface;
43 import android.graphics.drawable.BitmapDrawable;
44 import android.graphics.drawable.Drawable;
45 import android.net.Uri;
46 import android.net.http.SslCertificate;
47 import android.net.http.SslError;
48 import android.os.AsyncTask;
49 import android.os.Build;
50 import android.os.Bundle;
51 import android.os.Environment;
52 import android.os.Handler;
53 import android.os.Message;
54 import android.preference.PreferenceManager;
55 import android.print.PrintDocumentAdapter;
56 import android.print.PrintManager;
57 import android.provider.DocumentsContract;
58 import android.text.Editable;
59 import android.text.Spanned;
60 import android.text.TextWatcher;
61 import android.text.style.ForegroundColorSpan;
62 import android.util.Patterns;
63 import android.util.TypedValue;
64 import android.view.ContextMenu;
65 import android.view.GestureDetector;
66 import android.view.KeyEvent;
67 import android.view.Menu;
68 import android.view.MenuItem;
69 import android.view.MotionEvent;
70 import android.view.View;
71 import android.view.ViewGroup;
72 import android.view.WindowManager;
73 import android.view.inputmethod.InputMethodManager;
74 import android.webkit.CookieManager;
75 import android.webkit.HttpAuthHandler;
76 import android.webkit.SslErrorHandler;
77 import android.webkit.ValueCallback;
78 import android.webkit.WebBackForwardList;
79 import android.webkit.WebChromeClient;
80 import android.webkit.WebResourceResponse;
81 import android.webkit.WebSettings;
82 import android.webkit.WebStorage;
83 import android.webkit.WebView;
84 import android.webkit.WebViewClient;
85 import android.webkit.WebViewDatabase;
86 import android.widget.ArrayAdapter;
87 import android.widget.CheckBox;
88 import android.widget.CursorAdapter;
89 import android.widget.EditText;
90 import android.widget.FrameLayout;
91 import android.widget.ImageView;
92 import android.widget.LinearLayout;
93 import android.widget.ListView;
94 import android.widget.ProgressBar;
95 import android.widget.RadioButton;
96 import android.widget.RelativeLayout;
97 import android.widget.TextView;
98
99 import androidx.annotation.NonNull;
100 import androidx.appcompat.app.ActionBar;
101 import androidx.appcompat.app.ActionBarDrawerToggle;
102 import androidx.appcompat.app.AppCompatActivity;
103 import androidx.appcompat.app.AppCompatDelegate;
104 import androidx.appcompat.widget.Toolbar;
105 import androidx.coordinatorlayout.widget.CoordinatorLayout;
106 import androidx.core.content.res.ResourcesCompat;
107 import androidx.core.view.GravityCompat;
108 import androidx.drawerlayout.widget.DrawerLayout;
109 import androidx.fragment.app.DialogFragment;
110 import androidx.fragment.app.Fragment;
111 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
112 import androidx.viewpager.widget.ViewPager;
113 import androidx.webkit.WebSettingsCompat;
114 import androidx.webkit.WebViewFeature;
115
116 import com.google.android.material.appbar.AppBarLayout;
117 import com.google.android.material.floatingactionbutton.FloatingActionButton;
118 import com.google.android.material.navigation.NavigationView;
119 import com.google.android.material.snackbar.Snackbar;
120 import com.google.android.material.tabs.TabLayout;
121
122 import com.stoutner.privacybrowser.BuildConfig;
123 import com.stoutner.privacybrowser.R;
124 import com.stoutner.privacybrowser.adapters.WebViewPagerAdapter;
125 import com.stoutner.privacybrowser.asynctasks.GetHostIpAddresses;
126 import com.stoutner.privacybrowser.asynctasks.PopulateBlocklists;
127 import com.stoutner.privacybrowser.asynctasks.PrepareSaveDialog;
128 import com.stoutner.privacybrowser.asynctasks.SaveUrl;
129 import com.stoutner.privacybrowser.asynctasks.SaveWebpageImage;
130 import com.stoutner.privacybrowser.dataclasses.PendingDialog;
131 import com.stoutner.privacybrowser.dialogs.AdConsentDialog;
132 import com.stoutner.privacybrowser.dialogs.CreateBookmarkDialog;
133 import com.stoutner.privacybrowser.dialogs.CreateBookmarkFolderDialog;
134 import com.stoutner.privacybrowser.dialogs.CreateHomeScreenShortcutDialog;
135 import com.stoutner.privacybrowser.dialogs.EditBookmarkFolderDialog;
136 import com.stoutner.privacybrowser.dialogs.FontSizeDialog;
137 import com.stoutner.privacybrowser.dialogs.HttpAuthenticationDialog;
138 import com.stoutner.privacybrowser.dialogs.OpenDialog;
139 import com.stoutner.privacybrowser.dialogs.ProxyNotInstalledDialog;
140 import com.stoutner.privacybrowser.dialogs.PinnedMismatchDialog;
141 import com.stoutner.privacybrowser.dialogs.SaveWebpageDialog;
142 import com.stoutner.privacybrowser.dialogs.SslCertificateErrorDialog;
143 import com.stoutner.privacybrowser.dialogs.UrlHistoryDialog;
144 import com.stoutner.privacybrowser.dialogs.ViewSslCertificateDialog;
145 import com.stoutner.privacybrowser.dialogs.WaitingForProxyDialog;
146 import com.stoutner.privacybrowser.fragments.WebViewTabFragment;
147 import com.stoutner.privacybrowser.helpers.AdHelper;
148 import com.stoutner.privacybrowser.helpers.BlocklistHelper;
149 import com.stoutner.privacybrowser.helpers.BookmarksDatabaseHelper;
150 import com.stoutner.privacybrowser.helpers.DomainsDatabaseHelper;
151 import com.stoutner.privacybrowser.helpers.ProxyHelper;
152 import com.stoutner.privacybrowser.views.NestedScrollWebView;
153
154 import java.io.ByteArrayInputStream;
155 import java.io.ByteArrayOutputStream;
156 import java.io.File;
157 import java.io.FileInputStream;
158 import java.io.FileOutputStream;
159 import java.io.IOException;
160 import java.io.InputStream;
161 import java.io.OutputStream;
162 import java.io.UnsupportedEncodingException;
163
164 import java.net.MalformedURLException;
165 import java.net.URL;
166 import java.net.URLDecoder;
167 import java.net.URLEncoder;
168
169 import java.text.NumberFormat;
170
171 import java.util.ArrayList;
172 import java.util.Calendar;
173 import java.util.Date;
174 import java.util.HashMap;
175 import java.util.HashSet;
176 import java.util.List;
177 import java.util.Map;
178 import java.util.Objects;
179 import java.util.Set;
180 import java.util.concurrent.ExecutorService;
181 import java.util.concurrent.Executors;
182
183 public class MainWebViewActivity extends AppCompatActivity implements CreateBookmarkDialog.CreateBookmarkListener, CreateBookmarkFolderDialog.CreateBookmarkFolderListener,
184         EditBookmarkFolderDialog.EditBookmarkFolderListener, FontSizeDialog.UpdateFontSizeListener, NavigationView.OnNavigationItemSelectedListener, OpenDialog.OpenListener,
185         PinnedMismatchDialog.PinnedMismatchListener, PopulateBlocklists.PopulateBlocklistsListener, SaveWebpageDialog.SaveWebpageListener, UrlHistoryDialog.NavigateHistoryListener,
186         WebViewTabFragment.NewTabListener {
187
188     // The executor service handles background tasks.  It is accessed from `ViewSourceActivity`.
189     public static ExecutorService executorService = Executors.newFixedThreadPool(4);
190
191     // `orbotStatus` is public static so it can be accessed from `OrbotProxyHelper`.  It is also used in `onCreate()`, `onResume()`, and `applyProxy()`.
192     public static String orbotStatus = "unknown";
193
194     // The WebView pager adapter is accessed from `HttpAuthenticationDialog`, `PinnedMismatchDialog`, and `SslCertificateErrorDialog`.  It is also used in `onCreate()`, `onResume()`, and `addTab()`.
195     public static WebViewPagerAdapter webViewPagerAdapter;
196
197     // `restartFromBookmarksActivity` is public static so it can be accessed from `BookmarksActivity`.  It is also used in `onRestart()`.
198     public static boolean restartFromBookmarksActivity;
199
200     // Define the public static variables.
201     public static ArrayList<PendingDialog> pendingDialogsArrayList =  new ArrayList<>();
202
203     // `currentBookmarksFolder` is public static so it can be accessed from `BookmarksActivity`.  It is also used in `onCreate()`, `onBackPressed()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`,
204     // `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `loadBookmarksFolder()`.
205     public static String currentBookmarksFolder;
206
207     // The user agent constants are public static so they can be accessed from `SettingsFragment`, `DomainsActivity`, and `DomainSettingsFragment`.
208     public final static int UNRECOGNIZED_USER_AGENT = -1;
209     public final static int SETTINGS_WEBVIEW_DEFAULT_USER_AGENT = 1;
210     public final static int SETTINGS_CUSTOM_USER_AGENT = 12;
211     public final static int DOMAINS_SYSTEM_DEFAULT_USER_AGENT = 0;
212     public final static int DOMAINS_WEBVIEW_DEFAULT_USER_AGENT = 2;
213     public final static int DOMAINS_CUSTOM_USER_AGENT = 13;
214
215     // Define the start activity for result request codes.  The public static entries are accessed from `OpenDialog()` and `SaveWebpageDialog()`.
216     private final int BROWSE_FILE_UPLOAD_REQUEST_CODE = 0;
217     public final static int BROWSE_OPEN_REQUEST_CODE = 1;
218     public final static int BROWSE_SAVE_WEBPAGE_REQUEST_CODE = 2;
219
220     // The proxy mode is public static so it can be accessed from `ProxyHelper()`.
221     // It is also used in `onRestart()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `applyAppSettings()`, and `applyProxy()`.
222     // It will be updated in `applyAppSettings()`, but it needs to be initialized here or the first run of `onPrepareOptionsMenu()` crashes.
223     public static String proxyMode = ProxyHelper.NONE;
224
225     // Define the saved instance state constants.
226     private final String SAVED_STATE_ARRAY_LIST = "saved_state_array_list";
227     private final String SAVED_NESTED_SCROLL_WEBVIEW_STATE_ARRAY_LIST = "saved_nested_scroll_webview_state_array_list";
228     private final String SAVED_TAB_POSITION = "saved_tab_position";
229     private final String PROXY_MODE = "proxy_mode";
230
231     // Define the saved instance state variables.
232     private ArrayList<Bundle> savedStateArrayList;
233     private ArrayList<Bundle> savedNestedScrollWebViewStateArrayList;
234     private int savedTabPosition;
235     private String savedProxyMode;
236
237     // Define the class variables.
238     @SuppressWarnings("rawtypes")
239     AsyncTask populateBlocklists;
240
241     // The current WebView is used in `onCreate()`, `onPrepareOptionsMenu()`, `onOptionsItemSelected()`, `onNavigationItemSelected()`, `onRestart()`, `onCreateContextMenu()`, `findPreviousOnPage()`,
242     // `findNextOnPage()`, `closeFindOnPage()`, `loadUrlFromTextBox()`, `onSslMismatchBack()`, `applyProxy()`, and `applyDomainSettings()`.
243     private NestedScrollWebView currentWebView;
244
245     // `customHeader` is used in `onCreate()`, `onOptionsItemSelected()`, `onCreateContextMenu()`, and `loadUrl()`.
246     private final Map<String, String> customHeaders = new HashMap<>();
247
248     // The search URL is set in `applyAppSettings()` and used in `onNewIntent()`, `loadUrlFromTextBox()`, `initializeApp()`, and `initializeWebView()`.
249     private String searchURL;
250
251     // The blocklists are populated in `finishedPopulatingBlocklists()` and accessed from `initializeWebView()`.
252     private ArrayList<List<String[]>> easyList;
253     private ArrayList<List<String[]>> easyPrivacy;
254     private ArrayList<List<String[]>> fanboysAnnoyanceList;
255     private ArrayList<List<String[]>> fanboysSocialList;
256     private ArrayList<List<String[]>> ultraList;
257     private ArrayList<List<String[]>> ultraPrivacy;
258
259     // The action bar drawer toggle is initialized in `onCreate()` and used in `onResume()`.
260     private ActionBarDrawerToggle actionBarDrawerToggle;
261
262     // The color spans are used in `onCreate()` and `highlightUrlText()`.
263     private ForegroundColorSpan redColorSpan;
264     private ForegroundColorSpan initialGrayColorSpan;
265     private ForegroundColorSpan finalGrayColorSpan;
266
267     // `bookmarksDatabaseHelper` is used in `onCreate()`, `onDestroy`, `onOptionsItemSelected()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`,
268     // and `loadBookmarksFolder()`.
269     private BookmarksDatabaseHelper bookmarksDatabaseHelper;
270
271     // `bookmarksCursor` is used in `onDestroy()`, `onOptionsItemSelected()`, `onCreateBookmark()`, `onCreateBookmarkFolder()`, `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `loadBookmarksFolder()`.
272     private Cursor bookmarksCursor;
273
274     // `bookmarksCursorAdapter` is used in `onCreateBookmark()`, `onCreateBookmarkFolder()` `onSaveEditBookmark()`, `onSaveEditBookmarkFolder()`, and `loadBookmarksFolder()`.
275     private CursorAdapter bookmarksCursorAdapter;
276
277     // `oldFolderNameString` is used in `onCreate()` and `onSaveEditBookmarkFolder()`.
278     private String oldFolderNameString;
279
280     // `fileChooserCallback` is used in `onCreate()` and `onActivityResult()`.
281     private ValueCallback<Uri[]> fileChooserCallback;
282
283     // The default progress view offsets are set in `onCreate()` and used in `initializeWebView()`.
284     private int appBarHeight;
285     private int defaultProgressViewStartOffset;
286     private int defaultProgressViewEndOffset;
287
288     // The URL sanitizers are set in `applyAppSettings()` and used in `sanitizeUrl()`.
289     private boolean sanitizeGoogleAnalytics;
290     private boolean sanitizeFacebookClickIds;
291     private boolean sanitizeTwitterAmpRedirects;
292
293     // Declare the class variables
294     private BroadcastReceiver orbotStatusBroadcastReceiver;
295     private String webViewDefaultUserAgent;
296     private boolean incognitoModeEnabled;
297     private boolean fullScreenBrowsingModeEnabled;
298     private boolean inFullScreenBrowsingMode;
299     private boolean downloadWithExternalApp;
300     private boolean hideAppBar;
301     private boolean scrollAppBar;
302     private boolean bottomAppBar;
303     private boolean loadingNewIntent;
304     private boolean reapplyDomainSettingsOnRestart;
305     private boolean reapplyAppSettingsOnRestart;
306     private boolean displayingFullScreenVideo;
307     private boolean waitingForProxy;
308
309     // Define the class variables.
310     private long lastScrollUpdate = 0;
311
312     // Declare the class views.
313     private FrameLayout rootFrameLayout;
314     private DrawerLayout drawerLayout;
315     private RelativeLayout mainContentRelativeLayout;
316     private AppBarLayout appBarLayout;
317     private Toolbar toolbar;
318     private RelativeLayout urlRelativeLayout;
319     private EditText urlEditText;
320     private ActionBar actionBar;
321     private LinearLayout findOnPageLinearLayout;
322     private LinearLayout tabsLinearLayout;
323     private TabLayout tabLayout;
324     private SwipeRefreshLayout swipeRefreshLayout;
325     private ViewPager webViewPager;
326     private FrameLayout fullScreenVideoFrameLayout;
327
328     // Declare the class menus.
329     private Menu optionsMenu;
330
331     // Declare the class menu items.
332     private MenuItem navigationBackMenuItem;
333     private MenuItem navigationForwardMenuItem;
334     private MenuItem navigationHistoryMenuItem;
335     private MenuItem navigationRequestsMenuItem;
336     private MenuItem optionsPrivacyMenuItem;
337     private MenuItem optionsRefreshMenuItem;
338     private MenuItem optionsCookiesMenuItem;
339     private MenuItem optionsDomStorageMenuItem;
340     private MenuItem optionsSaveFormDataMenuItem;
341     private MenuItem optionsClearDataMenuItem;
342     private MenuItem optionsClearCookiesMenuItem;
343     private MenuItem optionsClearDomStorageMenuItem;
344     private MenuItem optionsClearFormDataMenuItem;
345     private MenuItem optionsBlocklistsMenuItem;
346     private MenuItem optionsEasyListMenuItem;
347     private MenuItem optionsEasyPrivacyMenuItem;
348     private MenuItem optionsFanboysAnnoyanceListMenuItem;
349     private MenuItem optionsFanboysSocialBlockingListMenuItem;
350     private MenuItem optionsUltraListMenuItem;
351     private MenuItem optionsUltraPrivacyMenuItem;
352     private MenuItem optionsBlockAllThirdPartyRequestsMenuItem;
353     private MenuItem optionsProxyMenuItem;
354     private MenuItem optionsProxyNoneMenuItem;
355     private MenuItem optionsProxyTorMenuItem;
356     private MenuItem optionsProxyI2pMenuItem;
357     private MenuItem optionsProxyCustomMenuItem;
358     private MenuItem optionsUserAgentMenuItem;
359     private MenuItem optionsUserAgentPrivacyBrowserMenuItem;
360     private MenuItem optionsUserAgentWebViewDefaultMenuItem;
361     private MenuItem optionsUserAgentFirefoxOnAndroidMenuItem;
362     private MenuItem optionsUserAgentChromeOnAndroidMenuItem;
363     private MenuItem optionsUserAgentSafariOnIosMenuItem;
364     private MenuItem optionsUserAgentFirefoxOnLinuxMenuItem;
365     private MenuItem optionsUserAgentChromiumOnLinuxMenuItem;
366     private MenuItem optionsUserAgentFirefoxOnWindowsMenuItem;
367     private MenuItem optionsUserAgentChromeOnWindowsMenuItem;
368     private MenuItem optionsUserAgentEdgeOnWindowsMenuItem;
369     private MenuItem optionsUserAgentInternetExplorerOnWindowsMenuItem;
370     private MenuItem optionsUserAgentSafariOnMacosMenuItem;
371     private MenuItem optionsUserAgentCustomMenuItem;
372     private MenuItem optionsSwipeToRefreshMenuItem;
373     private MenuItem optionsWideViewportMenuItem;
374     private MenuItem optionsDisplayImagesMenuItem;
375     private MenuItem optionsDarkWebViewMenuItem;
376     private MenuItem optionsFontSizeMenuItem;
377     private MenuItem optionsAddOrEditDomainMenuItem;
378
379     // Remove the warning about needing to override `performClick()` when using an `OnTouchListener` with WebView.
380     @SuppressLint("ClickableViewAccessibility")
381     @Override
382     protected void onCreate(Bundle savedInstanceState) {
383         // Run the default commands.
384         super.onCreate(savedInstanceState);
385
386         // Check to see if the activity has been restarted.
387         if (savedInstanceState != null) {
388             // Store the saved instance state variables.
389             savedStateArrayList = savedInstanceState.getParcelableArrayList(SAVED_STATE_ARRAY_LIST);
390             savedNestedScrollWebViewStateArrayList = savedInstanceState.getParcelableArrayList(SAVED_NESTED_SCROLL_WEBVIEW_STATE_ARRAY_LIST);
391             savedTabPosition = savedInstanceState.getInt(SAVED_TAB_POSITION);
392             savedProxyMode = savedInstanceState.getString(PROXY_MODE);
393         }
394
395         // Initialize the default preference values the first time the program is run.  `false` keeps this command from resetting any current preferences back to default.
396         PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
397
398         // Get a handle for the shared preferences.
399         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
400
401         // Get the preferences.
402         String appTheme = sharedPreferences.getString("app_theme", getString(R.string.app_theme_default_value));
403         boolean allowScreenshots = sharedPreferences.getBoolean(getString(R.string.allow_screenshots_key), false);
404         bottomAppBar = sharedPreferences.getBoolean(getString(R.string.bottom_app_bar_key), false);
405
406         // Get the theme entry values string array.
407         String[] appThemeEntryValuesStringArray = getResources().getStringArray(R.array.app_theme_entry_values);
408
409         // Set the app theme according to the preference.  A switch statement cannot be used because the theme entry values string array is not a compile time constant.
410         if (appTheme.equals(appThemeEntryValuesStringArray[1])) {  // The light theme is selected.
411             // Apply the light theme.
412             AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
413         } else if (appTheme.equals(appThemeEntryValuesStringArray[2])) {  // The dark theme is selected.
414             // Apply the dark theme.
415             AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
416         } else {  // The system default theme is selected.
417             if (Build.VERSION.SDK_INT >= 28) {  // The system default theme is supported.
418                 // Follow the system default theme.
419                 AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
420             } else {  // The system default theme is not supported.
421                 // Follow the battery saver mode.
422                 AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY);
423             }
424         }
425
426         // Disable screenshots if not allowed.
427         if (!allowScreenshots) {
428             getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
429         }
430
431         // Enable the drawing of the entire webpage.  This makes it possible to save a website image.  This must be done before anything else happens with the WebView.
432         if (Build.VERSION.SDK_INT >= 21) {
433             WebView.enableSlowWholeDocumentDraw();
434         }
435
436         // Set the theme.
437         setTheme(R.style.PrivacyBrowser);
438
439         // Set the content view.
440         if (bottomAppBar) {
441             setContentView(R.layout.main_framelayout_bottom_appbar);
442         } else {
443             setContentView(R.layout.main_framelayout_top_appbar);
444         }
445
446         // Get handles for the views.
447         rootFrameLayout = findViewById(R.id.root_framelayout);
448         drawerLayout = findViewById(R.id.drawerlayout);
449         mainContentRelativeLayout = findViewById(R.id.main_content_relativelayout);
450         appBarLayout = findViewById(R.id.appbar_layout);
451         toolbar = findViewById(R.id.toolbar);
452         findOnPageLinearLayout = findViewById(R.id.find_on_page_linearlayout);
453         tabsLinearLayout = findViewById(R.id.tabs_linearlayout);
454         tabLayout = findViewById(R.id.tablayout);
455         swipeRefreshLayout = findViewById(R.id.swiperefreshlayout);
456         webViewPager = findViewById(R.id.webviewpager);
457         NavigationView navigationView = findViewById(R.id.navigationview);
458         fullScreenVideoFrameLayout = findViewById(R.id.full_screen_video_framelayout);
459
460         // Get a handle for the navigation menu.
461         Menu navigationMenu = navigationView.getMenu();
462
463         // Get handles for the navigation menu items.
464         navigationBackMenuItem = navigationMenu.findItem(R.id.back);
465         navigationForwardMenuItem = navigationMenu.findItem(R.id.forward);
466         navigationHistoryMenuItem = navigationMenu.findItem(R.id.history);
467         navigationRequestsMenuItem = navigationMenu.findItem(R.id.requests);
468
469         // Listen for touches on the navigation menu.
470         navigationView.setNavigationItemSelectedListener(this);
471
472         // Get a handle for the app compat delegate.
473         AppCompatDelegate appCompatDelegate = getDelegate();
474
475         // Set the support action bar.
476         appCompatDelegate.setSupportActionBar(toolbar);
477
478         // Get a handle for the action bar.
479         actionBar = appCompatDelegate.getSupportActionBar();
480
481         // Remove the incorrect lint warning below that the action bar might be null.
482         assert actionBar != null;
483
484         // Add the custom layout, which shows the URL text bar.
485         actionBar.setCustomView(R.layout.url_app_bar);
486         actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
487
488         // Get handles for the views in the URL app bar.
489         urlRelativeLayout = findViewById(R.id.url_relativelayout);
490         urlEditText = findViewById(R.id.url_edittext);
491
492         // Create the hamburger icon at the start of the AppBar.
493         actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.open_navigation_drawer, R.string.close_navigation_drawer);
494
495         // Initially disable the sliding drawers.  They will be enabled once the blocklists are loaded.
496         drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
497
498         // Initialize the web view pager adapter.
499         webViewPagerAdapter = new WebViewPagerAdapter(getSupportFragmentManager());
500
501         // Set the pager adapter on the web view pager.
502         webViewPager.setAdapter(webViewPagerAdapter);
503
504         // Store up to 100 tabs in memory.
505         webViewPager.setOffscreenPageLimit(100);
506
507         // Initialize the app.
508         initializeApp();
509
510         // Apply the app settings from the shared preferences.
511         applyAppSettings();
512
513         // Populate the blocklists.
514         populateBlocklists = new PopulateBlocklists(this, this).execute();
515     }
516
517     @Override
518     protected void onNewIntent(Intent intent) {
519         // Run the default commands.
520         super.onNewIntent(intent);
521
522         // Replace the intent that started the app with this one.
523         setIntent(intent);
524
525         // Check to see if the app is being restarted from a saved state.
526         if (savedStateArrayList == null || savedStateArrayList.size() == 0) {  // The activity is not being restarted from a saved state.
527             // Get the information from the intent.
528             String intentAction = intent.getAction();
529             Uri intentUriData = intent.getData();
530             String intentStringExtra = intent.getStringExtra(Intent.EXTRA_TEXT);
531
532             // Determine if this is a web search.
533             boolean isWebSearch = ((intentAction != null) && intentAction.equals(Intent.ACTION_WEB_SEARCH));
534
535             // Only process the URI if it contains data or it is a web search.  If the user pressed the desktop icon after the app was already running the URI will be null.
536             if (intentUriData != null || intentStringExtra != null || isWebSearch) {
537                 // Exit the full screen video if it is displayed.
538                 if (displayingFullScreenVideo) {
539                     // Exit full screen video mode.
540                     exitFullScreenVideo();
541
542                     // Reload the current WebView.  Otherwise, it can display entirely black.
543                     currentWebView.reload();
544                 }
545
546                 // Get the shared preferences.
547                 SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
548
549                 // Create a URL string.
550                 String url;
551
552                 // If the intent action is a web search, perform the search.
553                 if (isWebSearch) {  // The intent is a web search.
554                     // Create an encoded URL string.
555                     String encodedUrlString;
556
557                     // Sanitize the search input and convert it to a search.
558                     try {
559                         encodedUrlString = URLEncoder.encode(intent.getStringExtra(SearchManager.QUERY), "UTF-8");
560                     } catch (UnsupportedEncodingException exception) {
561                         encodedUrlString = "";
562                     }
563
564                     // Add the base search URL.
565                     url = searchURL + encodedUrlString;
566                 } else if (intentUriData != null) {  // The intent contains a URL formatted as a URI.
567                     // Set the intent data as the URL.
568                     url = intentUriData.toString();
569                 } else {  // The intent contains a string, which might be a URL.
570                     // Set the intent string as the URL.
571                     url = intentStringExtra;
572                 }
573
574                 // Add a new tab if specified in the preferences.
575                 if (sharedPreferences.getBoolean("open_intents_in_new_tab", true)) {  // Load the URL in a new tab.
576                     // Set the loading new intent flag.
577                     loadingNewIntent = true;
578
579                     // Add a new tab.
580                     addNewTab(url, true);
581                 } else {  // Load the URL in the current tab.
582                     // Make it so.
583                     loadUrl(currentWebView, url);
584                 }
585
586                 // Close the navigation drawer if it is open.
587                 if (drawerLayout.isDrawerVisible(GravityCompat.START)) {
588                     drawerLayout.closeDrawer(GravityCompat.START);
589                 }
590
591                 // Close the bookmarks drawer if it is open.
592                 if (drawerLayout.isDrawerVisible(GravityCompat.END)) {
593                     drawerLayout.closeDrawer(GravityCompat.END);
594                 }
595             }
596         }
597     }
598
599     @Override
600     public void onRestart() {
601         // Run the default commands.
602         super.onRestart();
603
604         // Apply the app settings if returning from the Settings activity.
605         if (reapplyAppSettingsOnRestart) {
606             // Reset the reapply app settings on restart tracker.
607             reapplyAppSettingsOnRestart = false;
608
609             // Apply the app settings.
610             applyAppSettings();
611         }
612
613         // Apply the domain settings if returning from the settings or domains activity.
614         if (reapplyDomainSettingsOnRestart) {
615             // Reset the reapply domain settings on restart tracker.
616             reapplyDomainSettingsOnRestart = false;
617
618             // Reapply the domain settings for each tab.
619             for (int i = 0; i < webViewPagerAdapter.getCount(); i++) {
620                 // Get the WebView tab fragment.
621                 WebViewTabFragment webViewTabFragment = webViewPagerAdapter.getPageFragment(i);
622
623                 // Get the fragment view.
624                 View fragmentView = webViewTabFragment.getView();
625
626                 // Only reload the WebViews if they exist.
627                 if (fragmentView != null) {
628                     // Get the nested scroll WebView from the tab fragment.
629                     NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
630
631                     // Reset the current domain name so the domain settings will be reapplied.
632                     nestedScrollWebView.setCurrentDomainName("");
633
634                     // Reapply the domain settings if the URL is not null, which can happen if an empty tab is active when returning from settings.
635                     if (nestedScrollWebView.getUrl() != null) {
636                         applyDomainSettings(nestedScrollWebView, nestedScrollWebView.getUrl(), false, true, false);
637                     }
638                 }
639             }
640         }
641
642         // Update the bookmarks drawer if returning from the Bookmarks activity.
643         if (restartFromBookmarksActivity) {
644             // Close the bookmarks drawer.
645             drawerLayout.closeDrawer(GravityCompat.END);
646
647             // Reload the bookmarks drawer.
648             loadBookmarksFolder();
649
650             // Reset `restartFromBookmarksActivity`.
651             restartFromBookmarksActivity = false;
652         }
653
654         // Update the privacy icon.  `true` runs `invalidateOptionsMenu` as the last step.  This can be important if the screen was rotated.
655         updatePrivacyIcons(true);
656     }
657
658     // `onStart()` runs after `onCreate()` or `onRestart()`.  This is used instead of `onResume()` so the commands aren't called every time the screen is partially hidden.
659     @Override
660     public void onStart() {
661         // Run the default commands.
662         super.onStart();
663
664         // Resume any WebViews.
665         for (int i = 0; i < webViewPagerAdapter.getCount(); i++) {
666             // Get the WebView tab fragment.
667             WebViewTabFragment webViewTabFragment = webViewPagerAdapter.getPageFragment(i);
668
669             // Get the fragment view.
670             View fragmentView = webViewTabFragment.getView();
671
672             // Only resume the WebViews if they exist (they won't when the app is first created).
673             if (fragmentView != null) {
674                 // Get the nested scroll WebView from the tab fragment.
675                 NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
676
677                 // Resume the nested scroll WebView.
678                 nestedScrollWebView.onResume();
679             }
680         }
681
682         // Resume the nested scroll WebView JavaScript timers.  This is a global command that resumes JavaScript timers on all WebViews.
683         if (currentWebView != null) {
684             currentWebView.resumeTimers();
685         }
686
687         // Reapply the proxy settings if the system is using a proxy.  This redisplays the appropriate alert dialog.
688         if (!proxyMode.equals(ProxyHelper.NONE)) {
689             applyProxy(false);
690         }
691
692         // Reapply any system UI flags and the ad in the free flavor.
693         if (displayingFullScreenVideo || inFullScreenBrowsingMode) {  // The system is displaying a website or a video in full screen mode.
694             /* Hide the system bars.
695              * SYSTEM_UI_FLAG_FULLSCREEN hides the status bar at the top of the screen.
696              * SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN makes the root frame layout fill the area that is normally reserved for the status bar.
697              * SYSTEM_UI_FLAG_HIDE_NAVIGATION hides the navigation bar on the bottom or right of the screen.
698              * SYSTEM_UI_FLAG_IMMERSIVE_STICKY makes the status and navigation bars translucent and automatically re-hides them after they are shown.
699              */
700             rootFrameLayout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
701                     View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
702         } else if (BuildConfig.FLAVOR.contentEquals("free")) {  // The system in not in full screen mode.
703             // Get a handle for the ad view.  This cannot be a class variable because it changes with each ad load.
704             View adView = findViewById(R.id.adview);
705
706             // Resume the ad.
707             AdHelper.resumeAd(adView);
708         }
709
710         // Show any pending dialogs.
711         for (int i = 0; i < pendingDialogsArrayList.size(); i++) {
712             // Get the pending dialog from the array list.
713             PendingDialog pendingDialog = pendingDialogsArrayList.get(i);
714
715             // Show the pending dialog.
716             pendingDialog.dialogFragment.show(getSupportFragmentManager(), pendingDialog.tag);
717         }
718
719         // Clear the pending dialogs array list.
720         pendingDialogsArrayList.clear();
721     }
722
723     // `onStop()` runs after `onPause()`.  It is used instead of `onPause()` so the commands are not called every time the screen is partially hidden.
724     @Override
725     public void onStop() {
726         // Run the default commands.
727         super.onStop();
728
729         for (int i = 0; i < webViewPagerAdapter.getCount(); i++) {
730             // Get the WebView tab fragment.
731             WebViewTabFragment webViewTabFragment = webViewPagerAdapter.getPageFragment(i);
732
733             // Get the fragment view.
734             View fragmentView = webViewTabFragment.getView();
735
736             // Only pause the WebViews if they exist (they won't when the app is first created).
737             if (fragmentView != null) {
738                 // Get the nested scroll WebView from the tab fragment.
739                 NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
740
741                 // Pause the nested scroll WebView.
742                 nestedScrollWebView.onPause();
743             }
744         }
745
746         // Pause the WebView JavaScript timers.  This is a global command that pauses JavaScript on all WebViews.
747         if (currentWebView != null) {
748             currentWebView.pauseTimers();
749         }
750
751         // Pause the ad or it will continue to consume resources in the background on the free flavor.
752         if (BuildConfig.FLAVOR.contentEquals("free")) {
753             // Get a handle for the ad view.  This cannot be a class variable because it changes with each ad load.
754             View adView = findViewById(R.id.adview);
755
756             // Pause the ad.
757             AdHelper.pauseAd(adView);
758         }
759     }
760
761     @Override
762     public void onSaveInstanceState(@NonNull Bundle savedInstanceState) {
763         // Run the default commands.
764         super.onSaveInstanceState(savedInstanceState);
765
766         // Create the saved state array lists.
767         ArrayList<Bundle> savedStateArrayList = new ArrayList<>();
768         ArrayList<Bundle> savedNestedScrollWebViewStateArrayList = new ArrayList<>();
769
770         // Get the URLs from each tab.
771         for (int i = 0; i < webViewPagerAdapter.getCount(); i++) {
772             // Get the WebView tab fragment.
773             WebViewTabFragment webViewTabFragment = webViewPagerAdapter.getPageFragment(i);
774
775             // Get the fragment view.
776             View fragmentView = webViewTabFragment.getView();
777
778             if (fragmentView != null) {
779                 // Get the nested scroll WebView from the tab fragment.
780                 NestedScrollWebView nestedScrollWebView = fragmentView.findViewById(R.id.nestedscroll_webview);
781
782                 // Create saved state bundle.
783                 Bundle savedStateBundle = new Bundle();
784
785                 // Get the current states.
786                 nestedScrollWebView.saveState(savedStateBundle);
787                 Bundle savedNestedScrollWebViewStateBundle = nestedScrollWebView.saveNestedScrollWebViewState();
788
789                 // Store the saved states in the array lists.
790                 savedStateArrayList.add(savedStateBundle);
791                 savedNestedScrollWebViewStateArrayList.add(savedNestedScrollWebViewStateBundle);
792             }
793         }
794
795         // Get the current tab position.
796         int currentTabPosition = tabLayout.getSelectedTabPosition();
797
798         // Store the saved states in the bundle.
799         savedInstanceState.putParcelableArrayList(SAVED_STATE_ARRAY_LIST, savedStateArrayList);
800         savedInstanceState.putParcelableArrayList(SAVED_NESTED_SCROLL_WEBVIEW_STATE_ARRAY_LIST, savedNestedScrollWebViewStateArrayList);
801         savedInstanceState.putInt(SAVED_TAB_POSITION, currentTabPosition);
802         savedInstanceState.putString(PROXY_MODE, proxyMode);
803     }
804
805     @Override
806     public void onDestroy() {
807         // Unregister the orbot status broadcast receiver if it exists.
808         if (orbotStatusBroadcastReceiver != null) {
809             this.unregisterReceiver(orbotStatusBroadcastReceiver);
810         }
811
812         // Close the bookmarks cursor if it exists.
813         if (bookmarksCursor != null) {
814             bookmarksCursor.close();
815         }
816
817         // Close the bookmarks database if it exists.
818         if (bookmarksDatabaseHelper != null) {
819             bookmarksDatabaseHelper.close();
820         }
821
822         // Stop populating the blocklists if the AsyncTask is running in the background.
823         if (populateBlocklists != null) {
824             populateBlocklists.cancel(true);
825         }
826
827         // Run the default commands.
828         super.onDestroy();
829     }
830
831     @Override
832     public boolean onCreateOptionsMenu(Menu menu) {
833         // Inflate the menu.  This adds items to the action bar if it is present.
834         getMenuInflater().inflate(R.menu.webview_options_menu, menu);
835
836         // Store a handle for the options menu so it can be used by `onOptionsItemSelected()` and `updatePrivacyIcons()`.
837         optionsMenu = menu;
838
839         // Get handles for the class menu items.
840         optionsPrivacyMenuItem = menu.findItem(R.id.javascript);
841         optionsRefreshMenuItem = menu.findItem(R.id.refresh);
842         optionsCookiesMenuItem = menu.findItem(R.id.cookies);
843         optionsDomStorageMenuItem = menu.findItem(R.id.dom_storage);
844         optionsSaveFormDataMenuItem = menu.findItem(R.id.save_form_data);  // Form data can be removed once the minimum API >= 26.
845         optionsClearDataMenuItem = menu.findItem(R.id.clear_data);
846         optionsClearCookiesMenuItem = menu.findItem(R.id.clear_cookies);
847         optionsClearDomStorageMenuItem = menu.findItem(R.id.clear_dom_storage);
848         optionsClearFormDataMenuItem = menu.findItem(R.id.clear_form_data);  // Form data can be removed once the minimum API >= 26.
849         optionsBlocklistsMenuItem = menu.findItem(R.id.blocklists);
850         optionsEasyListMenuItem = menu.findItem(R.id.easylist);
851         optionsEasyPrivacyMenuItem = menu.findItem(R.id.easyprivacy);
852         optionsFanboysAnnoyanceListMenuItem = menu.findItem(R.id.fanboys_annoyance_list);
853         optionsFanboysSocialBlockingListMenuItem = menu.findItem(R.id.fanboys_social_blocking_list);
854         optionsUltraListMenuItem = menu.findItem(R.id.ultralist);
855         optionsUltraPrivacyMenuItem = menu.findItem(R.id.ultraprivacy);
856         optionsBlockAllThirdPartyRequestsMenuItem = menu.findItem(R.id.block_all_third_party_requests);
857         optionsProxyMenuItem = menu.findItem(R.id.proxy);
858         optionsProxyNoneMenuItem = menu.findItem(R.id.proxy_none);
859         optionsProxyTorMenuItem = menu.findItem(R.id.proxy_tor);
860         optionsProxyI2pMenuItem = menu.findItem(R.id.proxy_i2p);
861         optionsProxyCustomMenuItem = menu.findItem(R.id.proxy_custom);
862         optionsUserAgentMenuItem = menu.findItem(R.id.user_agent);
863         optionsUserAgentPrivacyBrowserMenuItem = menu.findItem(R.id.user_agent_privacy_browser);
864         optionsUserAgentWebViewDefaultMenuItem = menu.findItem(R.id.user_agent_webview_default);
865         optionsUserAgentFirefoxOnAndroidMenuItem = menu.findItem(R.id.user_agent_firefox_on_android);
866         optionsUserAgentChromeOnAndroidMenuItem = menu.findItem(R.id.user_agent_chrome_on_android);
867         optionsUserAgentSafariOnIosMenuItem = menu.findItem(R.id.user_agent_safari_on_ios);
868         optionsUserAgentFirefoxOnLinuxMenuItem = menu.findItem(R.id.user_agent_firefox_on_linux);
869         optionsUserAgentChromiumOnLinuxMenuItem = menu.findItem(R.id.user_agent_chromium_on_linux);
870         optionsUserAgentFirefoxOnWindowsMenuItem = menu.findItem(R.id.user_agent_firefox_on_windows);
871         optionsUserAgentChromeOnWindowsMenuItem = menu.findItem(R.id.user_agent_chrome_on_windows);
872         optionsUserAgentEdgeOnWindowsMenuItem = menu.findItem(R.id.user_agent_edge_on_windows);
873         optionsUserAgentInternetExplorerOnWindowsMenuItem = menu.findItem(R.id.user_agent_internet_explorer_on_windows);
874         optionsUserAgentSafariOnMacosMenuItem = menu.findItem(R.id.user_agent_safari_on_macos);
875         optionsUserAgentCustomMenuItem = menu.findItem(R.id.user_agent_custom);
876         optionsSwipeToRefreshMenuItem = menu.findItem(R.id.swipe_to_refresh);
877         optionsWideViewportMenuItem = menu.findItem(R.id.wide_viewport);
878         optionsDisplayImagesMenuItem = menu.findItem(R.id.display_images);
879         optionsDarkWebViewMenuItem = menu.findItem(R.id.dark_webview);
880         optionsFontSizeMenuItem = menu.findItem(R.id.font_size);
881         optionsAddOrEditDomainMenuItem = menu.findItem(R.id.add_or_edit_domain);
882
883         // Get handles for the method menu items.
884         MenuItem bookmarksMenuItem = menu.findItem(R.id.bookmarks);
885         MenuItem adConsentMenuItem = menu.findItem(R.id.ad_consent);
886
887         // Set the initial status of the privacy icons.  `false` does not call `invalidateOptionsMenu` as the last step.
888         updatePrivacyIcons(false);
889
890         // Only display the form data menu items if the API < 26.
891         optionsSaveFormDataMenuItem.setVisible(Build.VERSION.SDK_INT < 26);
892         optionsClearFormDataMenuItem.setVisible(Build.VERSION.SDK_INT < 26);
893
894         // Disable the clear form data menu item if the API >= 26 so that the status of the main Clear Data is calculated correctly.
895         optionsClearFormDataMenuItem.setEnabled(Build.VERSION.SDK_INT < 26);
896
897         // Only display the dark WebView menu item if API >= 21.
898         optionsDarkWebViewMenuItem.setVisible(Build.VERSION.SDK_INT >= 21);
899
900         // Only show Ad Consent if this is the free flavor.
901         adConsentMenuItem.setVisible(BuildConfig.FLAVOR.contentEquals("free"));
902
903         // Get the shared preferences.
904         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
905
906         // Get the dark theme and app bar preferences.
907         boolean displayAdditionalAppBarIcons = sharedPreferences.getBoolean(getString(R.string.display_additional_app_bar_icons_key), false);
908
909         // Set the status of the additional app bar icons.  Setting the refresh menu item to `SHOW_AS_ACTION_ALWAYS` makes it appear even on small devices like phones.
910         if (displayAdditionalAppBarIcons) {
911             optionsRefreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
912             bookmarksMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
913             optionsCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
914         } else { //Do not display the additional icons.
915             optionsRefreshMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
916             bookmarksMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
917             optionsCookiesMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
918         }
919
920         // Replace Refresh with Stop if a URL is already loading.
921         if (currentWebView != null && currentWebView.getProgress() != 100) {
922             // Set the title.
923             optionsRefreshMenuItem.setTitle(R.string.stop);
924
925             // Set the icon if it is displayed in the app bar.
926             if (displayAdditionalAppBarIcons) {
927                 // Get the current theme status.
928                 int currentThemeStatus = getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;
929
930                 // Set the icon according to the current theme status.
931                 if (currentThemeStatus == Configuration.UI_MODE_NIGHT_NO) {
932                     optionsRefreshMenuItem.setIcon(R.drawable.close_blue_day);
933                 } else {
934                     optionsRefreshMenuItem.setIcon(R.drawable.close_blue_night);
935                 }
936             }
937         }
938
939         // Done.
940         return true;
941     }
942
943     @Override
944     public boolean onPrepareOptionsMenu(Menu menu) {
945         // Get a handle for the cookie manager.
946         CookieManager cookieManager = CookieManager.getInstance();
947
948         // Initialize the current user agent string and the font size.
949         String currentUserAgent = getString(R.string.user_agent_privacy_browser);
950         int fontSize = 100;
951
952         // Set items that require the current web view to be populated.  It will be null when the program is first opened, as `onPrepareOptionsMenu()` is called before the first WebView is initialized.
953         if (currentWebView != null) {
954             // Set the add or edit domain text.
955             if (currentWebView.getDomainSettingsApplied()) {
956                 optionsAddOrEditDomainMenuItem.setTitle(R.string.edit_domain_settings);
957             } else {
958                 optionsAddOrEditDomainMenuItem.setTitle(R.string.add_domain_settings);
959             }
960
961             // Get the current user agent from the WebView.
962             currentUserAgent = currentWebView.getSettings().getUserAgentString();
963
964             // Get the current font size from the
965             fontSize = currentWebView.getSettings().getTextZoom();
966
967             // Set the status of the menu item checkboxes.
968             optionsDomStorageMenuItem.setChecked(currentWebView.getSettings().getDomStorageEnabled());
969             optionsSaveFormDataMenuItem.setChecked(currentWebView.getSettings().getSaveFormData());  // Form data can be removed once the minimum API >= 26.
970             optionsEasyListMenuItem.setChecked(currentWebView.getEasyListEnabled());
971             optionsEasyPrivacyMenuItem.setChecked(currentWebView.getEasyPrivacyEnabled());
972             optionsFanboysAnnoyanceListMenuItem.setChecked(currentWebView.getFanboysAnnoyanceListEnabled());
973             optionsFanboysSocialBlockingListMenuItem.setChecked(currentWebView.getFanboysSocialBlockingListEnabled());
974             optionsUltraListMenuItem.setChecked(currentWebView.getUltraListEnabled());
975             optionsUltraPrivacyMenuItem.setChecked(currentWebView.getUltraPrivacyEnabled());
976             optionsBlockAllThirdPartyRequestsMenuItem.setChecked(currentWebView.getBlockAllThirdPartyRequests());
977             optionsSwipeToRefreshMenuItem.setChecked(currentWebView.getSwipeToRefresh());
978             optionsWideViewportMenuItem.setChecked(currentWebView.getSettings().getUseWideViewPort());
979             optionsDisplayImagesMenuItem.setChecked(currentWebView.getSettings().getLoadsImagesAutomatically());
980
981             // Initialize the display names for the blocklists with the number of blocked requests.
982             optionsBlocklistsMenuItem.setTitle(getString(R.string.blocklists) + " - " + currentWebView.getRequestsCount(NestedScrollWebView.BLOCKED_REQUESTS));
983             optionsEasyListMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.EASYLIST) + " - " + getString(R.string.easylist));
984             optionsEasyPrivacyMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.EASYPRIVACY) + " - " + getString(R.string.easyprivacy));
985             optionsFanboysAnnoyanceListMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.FANBOYS_ANNOYANCE_LIST) + " - " + getString(R.string.fanboys_annoyance_list));
986             optionsFanboysSocialBlockingListMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.FANBOYS_SOCIAL_BLOCKING_LIST) + " - " + getString(R.string.fanboys_social_blocking_list));
987             optionsUltraListMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.ULTRALIST) + " - " + getString(R.string.ultralist));
988             optionsUltraPrivacyMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.ULTRAPRIVACY) + " - " + getString(R.string.ultraprivacy));
989             optionsBlockAllThirdPartyRequestsMenuItem.setTitle(currentWebView.getRequestsCount(NestedScrollWebView.THIRD_PARTY_REQUESTS) + " - " + getString(R.string.block_all_third_party_requests));
990
991             // Enable DOM Storage if JavaScript is enabled.
992             optionsDomStorageMenuItem.setEnabled(currentWebView.getSettings().getJavaScriptEnabled());
993
994             // Set the checkbox status for dark WebView if the WebView supports it.
995             if (WebViewFeature.isFeatureSupported(WebViewFeature.FORCE_DARK)) {
996                 optionsDarkWebViewMenuItem.setChecked(WebSettingsCompat.getForceDark(currentWebView.getSettings()) == WebSettingsCompat.FORCE_DARK_ON);
997             }
998         }
999
1000         // Set the cookies menu item checked status.
1001         optionsCookiesMenuItem.setChecked(cookieManager.acceptCookie());
1002
1003         // Enable Clear Cookies if there are any.
1004         optionsClearCookiesMenuItem.setEnabled(cookieManager.hasCookies());
1005
1006         // Get the application's private data directory, which will be something like `/data/user/0/com.stoutner.privacybrowser.standard`, which links to `/data/data/com.stoutner.privacybrowser.standard`.
1007         String privateDataDirectoryString = getApplicationInfo().dataDir;
1008
1009         // Get a count of the number of files in the Local Storage directory.
1010         File localStorageDirectory = new File (privateDataDirectoryString + "/app_webview/Local Storage/");
1011         int localStorageDirectoryNumberOfFiles = 0;
1012         if (localStorageDirectory.exists()) {
1013             // `Objects.requireNonNull` removes a lint warning that `localStorageDirectory.list` might produce a null pointed exception if it is dereferenced.
1014             localStorageDirectoryNumberOfFiles = Objects.requireNonNull(localStorageDirectory.list()).length;
1015         }
1016
1017         // Get a count of the number of files in the IndexedDB directory.
1018         File indexedDBDirectory = new File (privateDataDirectoryString + "/app_webview/IndexedDB");
1019         int indexedDBDirectoryNumberOfFiles = 0;
1020         if (indexedDBDirectory.exists()) {
1021             // `Objects.requireNonNull` removes a lint warning that `indexedDBDirectory.list` might produce a null pointed exception if it is dereferenced.
1022             indexedDBDirectoryNumberOfFiles = Objects.requireNonNull(indexedDBDirectory.list()).length;
1023         }
1024
1025         // Enable Clear DOM Storage if there is any.
1026         optionsClearDomStorageMenuItem.setEnabled(localStorageDirectoryNumberOfFiles > 0 || indexedDBDirectoryNumberOfFiles > 0);
1027
1028         // Enable Clear Form Data is there is any.  This can be removed once the minimum API >= 26.
1029         if (Build.VERSION.SDK_INT < 26) {
1030             // Get the WebView database.
1031             WebViewDatabase webViewDatabase = WebViewDatabase.getInstance(this);
1032
1033             // Enable the clear form data menu item if there is anything to clear.
1034             optionsClearFormDataMenuItem.setEnabled(webViewDatabase.hasFormData());
1035         }
1036
1037         // Enable Clear Data if any of the submenu items are enabled.
1038         optionsClearDataMenuItem.setEnabled(optionsClearCookiesMenuItem.isEnabled() || optionsClearDomStorageMenuItem.isEnabled() || optionsClearFormDataMenuItem.isEnabled());
1039
1040         // Disable Fanboy's Social Blocking List menu item if Fanboy's Annoyance List is checked.
1041         optionsFanboysSocialBlockingListMenuItem.setEnabled(!optionsFanboysAnnoyanceListMenuItem.isChecked());
1042
1043         // Set the proxy title and check the applied proxy.
1044         switch (proxyMode) {
1045             case ProxyHelper.NONE:
1046                 // Set the proxy title.
1047                 optionsProxyMenuItem.setTitle(getString(R.string.proxy) + " - " + getString(R.string.proxy_none));
1048
1049                 // Check the proxy None radio button.
1050                 optionsProxyNoneMenuItem.setChecked(true);
1051                 break;
1052
1053             case ProxyHelper.TOR:
1054                 // Set the proxy title.
1055                 optionsProxyMenuItem.setTitle(getString(R.string.proxy) + " - " + getString(R.string.proxy_tor));
1056
1057                 // Check the proxy Tor radio button.
1058                 optionsProxyTorMenuItem.setChecked(true);
1059                 break;
1060
1061             case ProxyHelper.I2P:
1062                 // Set the proxy title.
1063                 optionsProxyMenuItem.setTitle(getString(R.string.proxy) + " - " + getString(R.string.proxy_i2p));
1064
1065                 // Check the proxy I2P radio button.
1066                 optionsProxyI2pMenuItem.setChecked(true);
1067                 break;
1068
1069             case ProxyHelper.CUSTOM:
1070                 // Set the proxy title.
1071                 optionsProxyMenuItem.setTitle(getString(R.string.proxy) + " - " + getString(R.string.proxy_custom));
1072
1073                 // Check the proxy Custom radio button.
1074                 optionsProxyCustomMenuItem.setChecked(true);
1075                 break;
1076         }
1077
1078         // Select the current user agent menu item.  A switch statement cannot be used because the user agents are not compile time constants.
1079         if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[0])) {  // Privacy Browser.
1080             // Update the user agent menu item title.
1081             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_privacy_browser));
1082
1083             // Select the Privacy Browser radio box.
1084             optionsUserAgentPrivacyBrowserMenuItem.setChecked(true);
1085         } else if (currentUserAgent.equals(webViewDefaultUserAgent)) {  // WebView Default.
1086             // Update the user agent menu item title.
1087             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_webview_default));
1088
1089             // Select the WebView Default radio box.
1090             optionsUserAgentWebViewDefaultMenuItem.setChecked(true);
1091         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[2])) {  // Firefox on Android.
1092             // Update the user agent menu item title.
1093             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_firefox_on_android));
1094
1095             // Select the Firefox on Android radio box.
1096             optionsUserAgentFirefoxOnAndroidMenuItem.setChecked(true);
1097         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[3])) {  // Chrome on Android.
1098             // Update the user agent menu item title.
1099             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_chrome_on_android));
1100
1101             // Select the Chrome on Android radio box.
1102             optionsUserAgentChromeOnAndroidMenuItem.setChecked(true);
1103         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[4])) {  // Safari on iOS.
1104             // Update the user agent menu item title.
1105             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_safari_on_ios));
1106
1107             // Select the Safari on iOS radio box.
1108             optionsUserAgentSafariOnIosMenuItem.setChecked(true);
1109         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[5])) {  // Firefox on Linux.
1110             // Update the user agent menu item title.
1111             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_firefox_on_linux));
1112
1113             // Select the Firefox on Linux radio box.
1114             optionsUserAgentFirefoxOnLinuxMenuItem.setChecked(true);
1115         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[6])) {  // Chromium on Linux.
1116             // Update the user agent menu item title.
1117             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_chromium_on_linux));
1118
1119             // Select the Chromium on Linux radio box.
1120             optionsUserAgentChromiumOnLinuxMenuItem.setChecked(true);
1121         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[7])) {  // Firefox on Windows.
1122             // Update the user agent menu item title.
1123             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_firefox_on_windows));
1124
1125             // Select the Firefox on Windows radio box.
1126             optionsUserAgentFirefoxOnWindowsMenuItem.setChecked(true);
1127         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[8])) {  // Chrome on Windows.
1128             // Update the user agent menu item title.
1129             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_chrome_on_windows));
1130
1131             // Select the Chrome on Windows radio box.
1132             optionsUserAgentChromeOnWindowsMenuItem.setChecked(true);
1133         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[9])) {  // Edge on Windows.
1134             // Update the user agent menu item title.
1135             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_edge_on_windows));
1136
1137             // Select the Edge on Windows radio box.
1138             optionsUserAgentEdgeOnWindowsMenuItem.setChecked(true);
1139         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[10])) {  // Internet Explorer on Windows.
1140             // Update the user agent menu item title.
1141             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_internet_explorer_on_windows));
1142
1143             // Select the Internet on Windows radio box.
1144             optionsUserAgentInternetExplorerOnWindowsMenuItem.setChecked(true);
1145         } else if (currentUserAgent.equals(getResources().getStringArray(R.array.user_agent_data)[11])) {  // Safari on macOS.
1146             // Update the user agent menu item title.
1147             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_safari_on_macos));
1148
1149             // Select the Safari on macOS radio box.
1150             optionsUserAgentSafariOnMacosMenuItem.setChecked(true);
1151         } else {  // Custom user agent.
1152             // Update the user agent menu item title.
1153             optionsUserAgentMenuItem.setTitle(getString(R.string.options_user_agent) + " - " + getString(R.string.user_agent_custom));
1154
1155             // Select the Custom radio box.
1156             optionsUserAgentCustomMenuItem.setChecked(true);
1157         }
1158
1159         // Set the font size title.
1160         optionsFontSizeMenuItem.setTitle(getString(R.string.font_size) + " - " + fontSize + "%");
1161
1162         // Run all the other default commands.
1163         super.onPrepareOptionsMenu(menu);
1164
1165         // Display the menu.
1166         return true;
1167     }
1168
1169     @Override
1170     public boolean onOptionsItemSelected(MenuItem menuItem) {
1171         // Get a handle for the shared preferences.
1172         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
1173
1174         // Get a handle for the cookie manager.
1175         CookieManager cookieManager = CookieManager.getInstance();
1176
1177         // Get the selected menu item ID.
1178         int menuItemId = menuItem.getItemId();
1179
1180         // Run the commands that correlate to the selected menu item.
1181         if (menuItemId == R.id.javascript) {  // JavaScript.
1182             // Toggle the JavaScript status.
1183             currentWebView.getSettings().setJavaScriptEnabled(!currentWebView.getSettings().getJavaScriptEnabled());
1184
1185             // Update the privacy icon.
1186             updatePrivacyIcons(true);
1187
1188             // Display a `Snackbar`.
1189             if (currentWebView.getSettings().getJavaScriptEnabled()) {  // JavaScrip is enabled.
1190                 Snackbar.make(webViewPager, R.string.javascript_enabled, Snackbar.LENGTH_SHORT).show();
1191             } else if (cookieManager.acceptCookie()) {  // JavaScript is disabled, but first-party cookies are enabled.
1192                 Snackbar.make(webViewPager, R.string.javascript_disabled, Snackbar.LENGTH_SHORT).show();
1193             } else {  // Privacy mode.
1194                 Snackbar.make(webViewPager, R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
1195             }
1196
1197             // Reload the current WebView.
1198             currentWebView.reload();
1199
1200             // Consume the event.
1201             return true;
1202         } else if (menuItemId == R.id.refresh) {  // Refresh.
1203             // Run the command that correlates to the current status of the menu item.
1204             if (menuItem.getTitle().equals(getString(R.string.refresh))) {  // The refresh button was pushed.
1205                 // Reload the current WebView.
1206                 currentWebView.reload();
1207             } else {  // The stop button was pushed.
1208                 // Stop the loading of the WebView.
1209                 currentWebView.stopLoading();
1210             }
1211
1212             // Consume the event.
1213             return true;
1214         } else if (menuItemId == R.id.bookmarks) {  // Bookmarks.
1215             // Open the bookmarks drawer.
1216             drawerLayout.openDrawer(GravityCompat.END);
1217
1218             // Consume the event.
1219             return true;
1220         } else if (menuItemId == R.id.cookies) {  // Cookies.
1221             // Switch the first-party cookie status.
1222             cookieManager.setAcceptCookie(!cookieManager.acceptCookie());
1223
1224             // Store the cookie status.
1225             currentWebView.setAcceptCookies(cookieManager.acceptCookie());
1226
1227             // Update the menu checkbox.
1228             menuItem.setChecked(cookieManager.acceptCookie());
1229
1230             // Update the privacy icon.
1231             updatePrivacyIcons(true);
1232
1233             // Display a snackbar.
1234             if (cookieManager.acceptCookie()) {  // Cookies are enabled.
1235                 Snackbar.make(webViewPager, R.string.cookies_enabled, Snackbar.LENGTH_SHORT).show();
1236             } else if (currentWebView.getSettings().getJavaScriptEnabled()) {  // JavaScript is still enabled.
1237                 Snackbar.make(webViewPager, R.string.cookies_disabled, Snackbar.LENGTH_SHORT).show();
1238             } else {  // Privacy mode.
1239                 Snackbar.make(webViewPager, R.string.privacy_mode, Snackbar.LENGTH_SHORT).show();
1240             }
1241
1242             // Reload the current WebView.
1243             currentWebView.reload();
1244
1245             // Consume the event.
1246             return true;
1247         } else if (menuItemId == R.id.dom_storage) {  // DOM storage.
1248             // Toggle the status of domStorageEnabled.
1249             currentWebView.getSettings().setDomStorageEnabled(!currentWebView.getSettings().getDomStorageEnabled());
1250
1251             // Update the menu checkbox.
1252             menuItem.setChecked(currentWebView.getSettings().getDomStorageEnabled());
1253
1254             // Update the privacy icon.
1255             updatePrivacyIcons(true);
1256
1257             // Display a snackbar.
1258             if (currentWebView.getSettings().getDomStorageEnabled()) {
1259                 Snackbar.make(webViewPager, R.string.dom_storage_enabled, Snackbar.LENGTH_SHORT).show();
1260             } else {
1261                 Snackbar.make(webViewPager, R.string.dom_storage_disabled, Snackbar.LENGTH_SHORT).show();
1262             }
1263
1264             // Reload the current WebView.
1265             currentWebView.reload();
1266
1267             // Consume the event.
1268             return true;
1269         } else if (menuItemId == R.id.save_form_data) {  // Form data.  This can be removed once the minimum API >= 26.
1270             // Switch the status of saveFormDataEnabled.
1271             currentWebView.getSettings().setSaveFormData(!currentWebView.getSettings().getSaveFormData());
1272
1273             // Update the menu checkbox.
1274             menuItem.setChecked(currentWebView.getSettings().getSaveFormData());
1275
1276             // Display a snackbar.
1277             if (currentWebView.getSettings().getSaveFormData()) {
1278                 Snackbar.make(webViewPager, R.string.form_data_enabled, Snackbar.LENGTH_SHORT).show();
1279             } else {
1280                 Snackbar.make(webViewPager, R.string.form_data_disabled, Snackbar.LENGTH_SHORT).show();
1281             }
1282
1283             // Update the privacy icon.
1284             updatePrivacyIcons(true);
1285
1286             // Reload the current WebView.
1287             currentWebView.reload();
1288
1289             // Consume the event.
1290             return true;
1291         } else if (menuItemId == R.id.clear_cookies) {  // Clear cookies.
1292             // Create a snackbar.
1293             Snackbar.make(webViewPager, R.string.cookies_deleted, Snackbar.LENGTH_LONG)
1294                     .setAction(R.string.undo, v -> {
1295                         // Do nothing because everything will be handled by `onDismissed()` below.
1296                     })
1297                     .addCallback(new Snackbar.Callback() {
1298                         @Override
1299                         public void onDismissed(Snackbar snackbar, int event) {
1300                             if (event != Snackbar.Callback.DISMISS_EVENT_ACTION) {  // The snackbar was dismissed without the undo button being pushed.
1301                                 // Delete the cookies, which command varies by SDK.
1302                                 if (Build.VERSION.SDK_INT < 21) {
1303                                     cookieManager.removeAllCookie();
1304                                 } else {
1305                                     cookieManager.removeAllCookies(null);
1306                                 }
1307                             }
1308                         }
1309                     })
1310                     .show();
1311
1312             // Consume the event.
1313             return true;
1314         } else if (menuItemId == R.id.clear_dom_storage) {  // Clear DOM storage.
1315             // Create a snackbar.
1316             Snackbar.make(webViewPager, R.string.dom_storage_deleted, Snackbar.LENGTH_LONG)
1317                     .setAction(R.string.undo, v -> {
1318                         // Do nothing because everything will be handled by `onDismissed()` below.
1319                     })
1320                     .addCallback(new Snackbar.Callback() {
1321                         @Override
1322                         public void onDismissed(Snackbar snackbar, int event) {
1323                             if (event != Snackbar.Callback.DISMISS_EVENT_ACTION) {  // The snackbar was dismissed without the undo button being pushed.
1324                                 // Delete the DOM Storage.
1325                                 WebStorage webStorage = WebStorage.getInstance();
1326                                 webStorage.deleteAllData();
1327
1328                                 // Initialize a handler to manually delete the DOM storage files and directories.
1329                                 Handler deleteDomStorageHandler = new Handler();
1330
1331                                 // Setup a runnable to manually delete the DOM storage files and directories.
1332                                 Runnable deleteDomStorageRunnable = () -> {
1333                                     try {
1334                                         // Get a handle for the runtime.
1335                                         Runtime runtime = Runtime.getRuntime();
1336
1337                                         // Get the application's private data directory, which will be something like `/data/user/0/com.stoutner.privacybrowser.standard`,
1338                                         // which links to `/data/data/com.stoutner.privacybrowser.standard`.
1339                                         String privateDataDirectoryString = getApplicationInfo().dataDir;
1340
1341                                         // A string array must be used because the directory contains a space and `Runtime.exec` will otherwise not escape the string correctly.
1342                                         Process deleteLocalStorageProcess = runtime.exec(new String[]{"rm", "-rf", privateDataDirectoryString + "/app_webview/Local Storage/"});
1343
1344                                         // Multiple commands must be used because `Runtime.exec()` does not like `*`.
1345                                         Process deleteIndexProcess = runtime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/IndexedDB");
1346                                         Process deleteQuotaManagerProcess = runtime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager");
1347                                         Process deleteQuotaManagerJournalProcess = runtime.exec("rm -f " + privateDataDirectoryString + "/app_webview/QuotaManager-journal");
1348                                         Process deleteDatabasesProcess = runtime.exec("rm -rf " + privateDataDirectoryString + "/app_webview/databases");
1349
1350                                         // Wait for the processes to finish.
1351                                         deleteLocalStorageProcess.waitFor();
1352                                         deleteIndexProcess.waitFor();
1353                                         deleteQuotaManagerProcess.waitFor();
1354                                         deleteQuotaManagerJournalProcess.waitFor();
1355                                         deleteDatabasesProcess.waitFor();
1356                                     } catch (Exception exception) {
1357                                         // Do nothing if an error is thrown.
1358                                     }
1359                                 };
1360
1361                                 // Manually delete the DOM storage files after 200 milliseconds.
1362                                 deleteDomStorageHandler.postDelayed(deleteDomStorageRunnable, 200);
1363                             }
1364                         }
1365                     })
1366                     .show();
1367
1368             // Consume the event.
1369             return true;
1370         } else if (menuItemId == R.id.clear_form_data) {  // Clear form data.  This can be remove once the minimum API >= 26.
1371             // Create a snackbar.
1372             Snackbar.make(webViewPager, R.string.form_data_deleted, Snackbar.LENGTH_LONG)
1373                     .setAction(R.string.undo, v -> {
1374                         // Do nothing because everything will be handled by `onDismissed()` below.
1375                     })
1376                     .addCallback(new Snackbar.Callback() {
1377                         @Override
1378                         public void onDismissed(Snackbar snackbar, int event) {
1379                             if (event != Snackbar.Callback.DISMISS_EVENT_ACTION) {  // The snackbar was dismissed without the undo button being pushed.
1380                                 // Get a handle for the webView database.
1381                                 WebViewDatabase webViewDatabase = WebViewDatabase.getInstance(getApplicationContext());
1382
1383                                 // Delete the form data.
1384                                 webViewDatabase.clearFormData();
1385                             }
1386                         }
1387                     })
1388                     .show();
1389
1390             // Consume the event.
1391             return true;
1392         } else if (menuItemId == R.id.easylist) {  // EasyList.
1393             // Toggle the EasyList status.
1394             currentWebView.setEasyListEnabled(!currentWebView.getEasyListEnabled());
1395
1396             // Update the menu checkbox.
1397             menuItem.setChecked(currentWebView.getEasyListEnabled());
1398
1399             // Reload the current WebView.
1400             currentWebView.reload();
1401
1402             // Consume the event.
1403             return true;
1404         } else if (menuItemId == R.id.easyprivacy) {  // EasyPrivacy.
1405             // Toggle the EasyPrivacy status.
1406             currentWebView.setEasyPrivacyEnabled(!currentWebView.getEasyPrivacyEnabled());
1407
1408             // Update the menu checkbox.
1409             menuItem.setChecked(currentWebView.getEasyPrivacyEnabled());
1410
1411             // Reload the current WebView.
1412             currentWebView.reload();
1413
1414             // Consume the event.
1415             return true;
1416         } else if (menuItemId == R.id.fanboys_annoyance_list) {  // Fanboy's Annoyance List.
1417             // Toggle Fanboy's Annoyance List status.
1418             currentWebView.setFanboysAnnoyanceListEnabled(!currentWebView.getFanboysAnnoyanceListEnabled());
1419
1420             // Update the menu checkbox.
1421             menuItem.setChecked(currentWebView.getFanboysAnnoyanceListEnabled());
1422
1423             // Update the status of Fanboy's Social Blocking List.
1424             optionsFanboysSocialBlockingListMenuItem.setEnabled(!currentWebView.getFanboysAnnoyanceListEnabled());
1425
1426             // Reload the current WebView.
1427             currentWebView.reload();
1428
1429             // Consume the event.
1430             return true;
1431         } else if (menuItemId == R.id.fanboys_social_blocking_list) {  // Fanboy's Social Blocking List.
1432             // Toggle Fanboy's Social Blocking List status.
1433             currentWebView.setFanboysSocialBlockingListEnabled(!currentWebView.getFanboysSocialBlockingListEnabled());
1434
1435             // Update the menu checkbox.
1436             menuItem.setChecked(currentWebView.getFanboysSocialBlockingListEnabled());
1437
1438             // Reload the current WebView.
1439             currentWebView.reload();
1440
1441             // Consume the event.
1442             return true;
1443         } else if (menuItemId == R.id.ultralist) {  // UltraList.
1444             // Toggle the UltraList status.
1445             currentWebView.setUltraListEnabled(!currentWebView.getUltraListEnabled());
1446
1447             // Update the menu checkbox.
1448             menuItem.setChecked(currentWebView.getUltraListEnabled());
1449
1450             // Reload the current WebView.
1451             currentWebView.reload();
1452
1453             // Consume the event.
1454             return true;
1455         } else if (menuItemId == R.id.ultraprivacy) {  // UltraPrivacy.
1456             // Toggle the UltraPrivacy status.
1457             currentWebView.setUltraPrivacyEnabled(!currentWebView.getUltraPrivacyEnabled());
1458
1459             // Update the menu checkbox.
1460             menuItem.setChecked(currentWebView.getUltraPrivacyEnabled());
1461
1462             // Reload the current WebView.
1463             currentWebView.reload();
1464
1465             // Consume the event.
1466             return true;
1467         } else if (menuItemId == R.id.block_all_third_party_requests) {  // Block all third-party requests.
1468             //Toggle the third-party requests blocker status.
1469             currentWebView.setBlockAllThirdPartyRequests(!currentWebView.getBlockAllThirdPartyRequests());
1470
1471             // Update the menu checkbox.
1472             menuItem.setChecked(currentWebView.getBlockAllThirdPartyRequests());
1473
1474             // Reload the current WebView.
1475             currentWebView.reload();
1476
1477             // Consume the event.
1478             return true;
1479         } else if (menuItemId == R.id.proxy_none) {  // Proxy - None.
1480             // Update the proxy mode.
1481             proxyMode = ProxyHelper.NONE;
1482
1483             // Apply the proxy mode.
1484             applyProxy(true);
1485
1486             // Consume the event.
1487             return true;
1488         } else if (menuItemId == R.id.proxy_tor) {  // Proxy - Tor.
1489             // Update the proxy mode.
1490             proxyMode = ProxyHelper.TOR;
1491
1492             // Apply the proxy mode.
1493             applyProxy(true);
1494
1495             // Consume the event.
1496             return true;
1497         } else if (menuItemId == R.id.proxy_i2p) {  // Proxy - I2P.
1498             // Update the proxy mode.
1499             proxyMode = ProxyHelper.I2P;
1500
1501             // Apply the proxy mode.
1502             applyProxy(true);
1503
1504             // Consume the event.
1505             return true;
1506         } else if (menuItemId == R.id.proxy_custom) {  // Proxy - Custom.
1507             // Update the proxy mode.
1508             proxyMode = ProxyHelper.CUSTOM;
1509
1510             // Apply the proxy mode.
1511             applyProxy(true);
1512
1513             // Consume the event.
1514             return true;
1515         } else if (menuItemId == R.id.user_agent_privacy_browser) {  // User Agent - Privacy Browser.
1516             // Update the user agent.
1517             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[0]);
1518
1519             // Reload the current WebView.
1520             currentWebView.reload();
1521
1522             // Consume the event.
1523             return true;
1524         } else if (menuItemId == R.id.user_agent_webview_default) {  // User Agent - WebView Default.
1525             // Update the user agent.
1526             currentWebView.getSettings().setUserAgentString("");
1527
1528             // Reload the current WebView.
1529             currentWebView.reload();
1530
1531             // Consume the event.
1532             return true;
1533         } else if (menuItemId == R.id.user_agent_firefox_on_android) {  // User Agent - Firefox on Android.
1534             // Update the user agent.
1535             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[2]);
1536
1537             // Reload the current WebView.
1538             currentWebView.reload();
1539
1540             // Consume the event.
1541             return true;
1542         } else if (menuItemId == R.id.user_agent_chrome_on_android) {  // User Agent - Chrome on Android.
1543             // Update the user agent.
1544             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[3]);
1545
1546             // Reload the current WebView.
1547             currentWebView.reload();
1548
1549             // Consume the event.
1550             return true;
1551         } else if (menuItemId == R.id.user_agent_safari_on_ios) {  // User Agent - Safari on iOS.
1552             // Update the user agent.
1553             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[4]);
1554
1555             // Reload the current WebView.
1556             currentWebView.reload();
1557
1558             // Consume the event.
1559             return true;
1560         } else if (menuItemId == R.id.user_agent_firefox_on_linux) {  // User Agent - Firefox on Linux.
1561             // Update the user agent.
1562             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[5]);
1563
1564             // Reload the current WebView.
1565             currentWebView.reload();
1566
1567             // Consume the event.
1568             return true;
1569         } else if (menuItemId == R.id.user_agent_chromium_on_linux) {  // User Agent - Chromium on Linux.
1570             // Update the user agent.
1571             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[6]);
1572
1573             // Reload the current WebView.
1574             currentWebView.reload();
1575
1576             // Consume the event.
1577             return true;
1578         } else if (menuItemId == R.id.user_agent_firefox_on_windows) {  // User Agent - Firefox on Windows.
1579             // Update the user agent.
1580             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[7]);
1581
1582             // Reload the current WebView.
1583             currentWebView.reload();
1584
1585             // Consume the event.
1586             return true;
1587         } else if (menuItemId == R.id.user_agent_chrome_on_windows) {  // User Agent - Chrome on Windows.
1588             // Update the user agent.
1589             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[8]);
1590
1591             // Reload the current WebView.
1592             currentWebView.reload();
1593
1594             // Consume the event.
1595             return true;
1596         } else if (menuItemId == R.id.user_agent_edge_on_windows) {  // User Agent - Edge on Windows.
1597             // Update the user agent.
1598             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[9]);
1599
1600             // Reload the current WebView.
1601             currentWebView.reload();
1602
1603             // Consume the event.
1604             return true;
1605         } else if (menuItemId == R.id.user_agent_internet_explorer_on_windows) {  // User Agent - Internet Explorer on Windows.
1606             // Update the user agent.
1607             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[10]);
1608
1609             // Reload the current WebView.
1610             currentWebView.reload();
1611
1612             // Consume the event.
1613             return true;
1614         } else if (menuItemId == R.id.user_agent_safari_on_macos) {  // User Agent - Safari on macOS.
1615             // Update the user agent.
1616             currentWebView.getSettings().setUserAgentString(getResources().getStringArray(R.array.user_agent_data)[11]);
1617
1618             // Reload the current WebView.
1619             currentWebView.reload();
1620
1621             // Consume the event.
1622             return true;
1623         } else if (menuItemId == R.id.user_agent_custom) {  // User Agent - Custom.
1624             // Update the user agent.
1625             currentWebView.getSettings().setUserAgentString(sharedPreferences.getString("custom_user_agent", getString(R.string.custom_user_agent_default_value)));
1626
1627             // Reload the current WebView.
1628             currentWebView.reload();
1629
1630             // Consume the event.
1631             return true;
1632         } else if (menuItemId == R.id.font_size) {  // Font size.
1633             // Instantiate the font size dialog.
1634             DialogFragment fontSizeDialogFragment = FontSizeDialog.displayDialog(currentWebView.getSettings().getTextZoom());
1635
1636             // Show the font size dialog.
1637             fontSizeDialogFragment.show(getSupportFragmentManager(), getString(R.string.font_size));
1638
1639             // Consume the event.
1640             return true;
1641         } else if (menuItemId == R.id.swipe_to_refresh) {  // Swipe to refresh.
1642             // Toggle the stored status of swipe to refresh.
1643             currentWebView.setSwipeToRefresh(!currentWebView.getSwipeToRefresh());
1644
1645             // Update the swipe refresh layout.
1646             if (currentWebView.getSwipeToRefresh()) {  // Swipe to refresh is enabled.
1647                 // Only enable the swipe refresh layout if the WebView is scrolled to the top.  It is updated every time the scroll changes.
1648                 swipeRefreshLayout.setEnabled(currentWebView.getScrollY() == 0);
1649             } else {  // Swipe to refresh is disabled.
1650                 // Disable the swipe refresh layout.
1651                 swipeRefreshLayout.setEnabled(false);
1652             }
1653
1654             // Consume the event.
1655             return true;
1656         } else if (menuItemId == R.id.wide_viewport) {  // Wide viewport.
1657             // Toggle the viewport.
1658             currentWebView.getSettings().setUseWideViewPort(!currentWebView.getSettings().getUseWideViewPort());
1659
1660             // Consume the event.
1661             return true;
1662         } else if (menuItemId == R.id.display_images) {  // Display images.
1663             // Toggle the displaying of images.
1664             if (currentWebView.getSettings().getLoadsImagesAutomatically()) {  // Images are currently loaded automatically.
1665                 // Disable loading of images.
1666                 currentWebView.getSettings().setLoadsImagesAutomatically(false);
1667
1668                 // Reload the website to remove existing images.
1669                 currentWebView.reload();
1670             } else {  // Images are not currently loaded automatically.
1671                 // Enable loading of images.  Missing images will be loaded without the need for a reload.
1672                 currentWebView.getSettings().setLoadsImagesAutomatically(true);
1673             }
1674
1675             // Consume the event.
1676             return true;
1677         } else if (menuItemId == R.id.dark_webview) {  // Dark WebView.
1678             // Check to see if dark WebView is supported by this WebView.
1679             if (WebViewFeature.isFeatureSupported(WebViewFeature.FORCE_DARK)) {
1680                 // Toggle the dark WebView setting.
1681                 if (WebSettingsCompat.getForceDark(currentWebView.getSettings()) == WebSettingsCompat.FORCE_DARK_ON) {  // Dark WebView is currently enabled.
1682                     // Turn off dark WebView.
1683                     WebSettingsCompat.setForceDark(currentWebView.getSettings(), WebSettingsCompat.FORCE_DARK_OFF);
1684                 } else {  // Dark WebView is currently disabled.
1685                     // Turn on dark WebView.
1686                     WebSettingsCompat.setForceDark(currentWebView.getSettings(), WebSettingsCompat.FORCE_DARK_ON);
1687                 }
1688             }
1689
1690             // Consume the event.
1691             return true;
1692         } else if (menuItemId == R.id.find_on_page) {  // Find on page.
1693             // Get a handle for the views.
1694             Toolbar toolbar = findViewById(R.id.toolbar);
1695             LinearLayout findOnPageLinearLayout = findViewById(R.id.find_on_page_linearlayout);
1696             EditText findOnPageEditText = findViewById(R.id.find_on_page_edittext);
1697
1698             // Set the minimum height of the find on page linear layout to match the toolbar.
1699             findOnPageLinearLayout.setMinimumHeight(toolbar.getHeight());
1700
1701             // Hide the toolbar.
1702             toolbar.setVisibility(View.GONE);
1703
1704             // Show the find on page linear layout.
1705             findOnPageLinearLayout.setVisibility(View.VISIBLE);
1706
1707             // Display the keyboard.  The app must wait 200 ms before running the command to work around a bug in Android.
1708             // http://stackoverflow.com/questions/5520085/android-show-softkeyboard-with-showsoftinput-is-not-working
1709             findOnPageEditText.postDelayed(() -> {
1710                 // Set the focus on the find on page edit text.
1711                 findOnPageEditText.requestFocus();
1712
1713                 // Get a handle for the input method manager.
1714                 InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
1715
1716                 // Remove the lint warning below that the input method manager might be null.
1717                 assert inputMethodManager != null;
1718
1719                 // Display the keyboard.  `0` sets no input flags.
1720                 inputMethodManager.showSoftInput(findOnPageEditText, 0);
1721             }, 200);
1722
1723             // Consume the event.
1724             return true;
1725         } else if (menuItemId == R.id.print) {  // Print.
1726             // Get a print manager instance.
1727             PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE);
1728
1729             // Remove the lint error below that print manager might be null.
1730             assert printManager != null;
1731
1732             // Create a print document adapter from the current WebView.
1733             PrintDocumentAdapter printDocumentAdapter = currentWebView.createPrintDocumentAdapter();
1734
1735             // Print the document.
1736             printManager.print(getString(R.string.privacy_browser_webpage), printDocumentAdapter, null);
1737
1738             // Consume the event.
1739             return true;
1740         } else if (menuItemId == R.id.save_url) {  // Save URL.
1741             // Check the download preference.
1742             if (downloadWithExternalApp) {  // Download with an external app.
1743                 downloadUrlWithExternalApp(currentWebView.getCurrentUrl());
1744             } else {  // Handle the download inside of Privacy Browser.
1745                 // Prepare the save dialog.  The dialog will be displayed once the file size and the content disposition have been acquired.
1746                 new PrepareSaveDialog(this, this, getSupportFragmentManager(), SaveWebpageDialog.SAVE_URL, currentWebView.getSettings().getUserAgentString(),
1747                         currentWebView.getAcceptCookies()).execute(currentWebView.getCurrentUrl());
1748             }
1749
1750             // Consume the event.
1751             return true;
1752         } else if (menuItemId == R.id.save_archive) {
1753             // Instantiate the save dialog.
1754             DialogFragment saveArchiveFragment = SaveWebpageDialog.saveWebpage(SaveWebpageDialog.SAVE_ARCHIVE, currentWebView.getCurrentUrl(), null, null, null,
1755                     false);
1756
1757             // Show the save dialog.  It must be named `save_dialog` so that the file picker can update the file name.
1758             saveArchiveFragment.show(getSupportFragmentManager(), getString(R.string.save_dialog));
1759
1760             return true;
1761         } else if (menuItemId == R.id.save_image) {  // Save image.
1762             // Instantiate the save dialog.
1763             DialogFragment saveImageFragment = SaveWebpageDialog.saveWebpage(SaveWebpageDialog.SAVE_IMAGE, currentWebView.getCurrentUrl(), null, null, null,
1764                     false);
1765
1766             // Show the save dialog.  It must be named `save_dialog` so that the file picker can update the file name.
1767             saveImageFragment.show(getSupportFragmentManager(), getString(R.string.save_dialog));
1768
1769             // Consume the event.
1770             return true;
1771         } else if (menuItemId == R.id.add_to_homescreen) {  // Add to homescreen.
1772             // Instantiate the create home screen shortcut dialog.
1773             DialogFragment createHomeScreenShortcutDialogFragment = CreateHomeScreenShortcutDialog.createDialog(currentWebView.getTitle(), currentWebView.getUrl(),
1774                     currentWebView.getFavoriteOrDefaultIcon());
1775
1776             // Show the create home screen shortcut dialog.
1777             createHomeScreenShortcutDialogFragment.show(getSupportFragmentManager(), getString(R.string.create_shortcut));
1778
1779             // Consume the event.
1780             return true;
1781         } else if (menuItemId == R.id.view_source) {  // View source.
1782             // Create an intent to launch the view source activity.
1783             Intent viewSourceIntent = new Intent(this, ViewSourceActivity.class);
1784
1785             // Add the variables to the intent.
1786             viewSourceIntent.putExtra(ViewSourceActivityKt.CURRENT_URL, currentWebView.getUrl());
1787             viewSourceIntent.putExtra(ViewSourceActivityKt.USER_AGENT, currentWebView.getSettings().getUserAgentString());
1788
1789             // Make it so.
1790             startActivity(viewSourceIntent);
1791
1792             // Consume the event.
1793             return true;
1794         } else if (menuItemId == R.id.share_url) {  // Share URL.
1795             // Setup the share string.
1796             String shareString = currentWebView.getTitle() + " – " + currentWebView.getUrl();
1797
1798             // Create the share intent.
1799             Intent shareIntent = new Intent(Intent.ACTION_SEND);
1800
1801             // Add the share string to the intent.
1802             shareIntent.putExtra(Intent.EXTRA_TEXT, shareString);
1803
1804             // Set the MIME type.
1805             shareIntent.setType("text/plain");
1806
1807             // Set the intent to open in a new task.
1808             shareIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
1809
1810             // Make it so.
1811             startActivity(Intent.createChooser(shareIntent, getString(R.string.share_url)));
1812
1813             // Consume the event.
1814             return true;
1815         } else if (menuItemId == R.id.open_with_app) {  // Open with app.
1816             // Open the URL with an outside app.
1817             openWithApp(currentWebView.getUrl());
1818
1819             // Consume the event.
1820             return true;
1821         } else if (menuItemId == R.id.open_with_browser) {  // Open with browser.
1822             // Open the URL with an outside browser.
1823             openWithBrowser(currentWebView.getUrl());
1824
1825             // Consume the event.
1826             return true;
1827         } else if (menuItemId == R.id.add_or_edit_domain) {  // Add or edit domain.
1828             // Check if domain settings currently exist.
1829             if (currentWebView.getDomainSettingsApplied()) {  // Edit the current domain settings.
1830                 // Reapply the domain settings on returning to `MainWebViewActivity`.
1831                 reapplyDomainSettingsOnRestart = true;
1832
1833                 // Create an intent to launch the domains activity.
1834                 Intent domainsIntent = new Intent(this, DomainsActivity.class);
1835
1836                 // Add the extra information to the intent.
1837                 domainsIntent.putExtra("load_domain", currentWebView.getDomainSettingsDatabaseId());
1838                 domainsIntent.putExtra("close_on_back", true);
1839                 domainsIntent.putExtra("current_url", currentWebView.getUrl());
1840                 domainsIntent.putExtra("current_ip_addresses", currentWebView.getCurrentIpAddresses());
1841
1842                 // Get the current certificate.
1843                 SslCertificate sslCertificate = currentWebView.getCertificate();
1844
1845                 // Check to see if the SSL certificate is populated.
1846                 if (sslCertificate != null) {
1847                     // Extract the certificate to strings.
1848                     String issuedToCName = sslCertificate.getIssuedTo().getCName();
1849                     String issuedToOName = sslCertificate.getIssuedTo().getOName();
1850                     String issuedToUName = sslCertificate.getIssuedTo().getUName();
1851                     String issuedByCName = sslCertificate.getIssuedBy().getCName();
1852                     String issuedByOName = sslCertificate.getIssuedBy().getOName();
1853                     String issuedByUName = sslCertificate.getIssuedBy().getUName();
1854                     long startDateLong = sslCertificate.getValidNotBeforeDate().getTime();
1855                     long endDateLong = sslCertificate.getValidNotAfterDate().getTime();
1856
1857                     // Add the certificate to the intent.
1858                     domainsIntent.putExtra("ssl_issued_to_cname", issuedToCName);
1859                     domainsIntent.putExtra("ssl_issued_to_oname", issuedToOName);
1860                     domainsIntent.putExtra("ssl_issued_to_uname", issuedToUName);
1861                     domainsIntent.putExtra("ssl_issued_by_cname", issuedByCName);
1862                     domainsIntent.putExtra("ssl_issued_by_oname", issuedByOName);
1863                     domainsIntent.putExtra("ssl_issued_by_uname", issuedByUName);
1864                     domainsIntent.putExtra("ssl_start_date", startDateLong);
1865                     domainsIntent.putExtra("ssl_end_date", endDateLong);
1866                 }
1867
1868                 // Make it so.
1869                 startActivity(domainsIntent);
1870             } else {  // Add a new domain.
1871                 // Apply the new domain settings on returning to `MainWebViewActivity`.
1872                 reapplyDomainSettingsOnRestart = true;
1873
1874                 // Get the current domain
1875                 Uri currentUri = Uri.parse(currentWebView.getUrl());
1876                 String currentDomain = currentUri.getHost();
1877
1878                 // Initialize the database handler.  The `0` specifies the database version, but that is ignored and set instead using a constant in `DomainsDatabaseHelper`.
1879                 DomainsDatabaseHelper domainsDatabaseHelper = new DomainsDatabaseHelper(this, null, null, 0);
1880
1881                 // Create the domain and store the database ID.
1882                 int newDomainDatabaseId = domainsDatabaseHelper.addDomain(currentDomain);
1883
1884                 // Create an intent to launch the domains activity.
1885                 Intent domainsIntent = new Intent(this, DomainsActivity.class);
1886
1887                 // Add the extra information to the intent.
1888                 domainsIntent.putExtra("load_domain", newDomainDatabaseId);
1889                 domainsIntent.putExtra("close_on_back", true);
1890                 domainsIntent.putExtra("current_url", currentWebView.getUrl());
1891                 domainsIntent.putExtra("current_ip_addresses", currentWebView.getCurrentIpAddresses());
1892
1893                 // Get the current certificate.
1894                 SslCertificate sslCertificate = currentWebView.getCertificate();
1895
1896                 // Check to see if the SSL certificate is populated.
1897                 if (sslCertificate != null) {
1898                     // Extract the certificate to strings.
1899                     String issuedToCName = sslCertificate.getIssuedTo().getCName();
1900                     String issuedToOName = sslCertificate.getIssuedTo().getOName();
1901                     String issuedToUName = sslCertificate.getIssuedTo().getUName();
1902                     String issuedByCName = sslCertificate.getIssuedBy().getCName();
1903                     String issuedByOName = sslCertificate.getIssuedBy().getOName();
1904                     String issuedByUName = sslCertificate.getIssuedBy().getUName();
1905                     long startDateLong = sslCertificate.getValidNotBeforeDate().getTime();
1906                     long endDateLong = sslCertificate.getValidNotAfterDate().getTime();
1907
1908                     // Add the certificate to the intent.
1909                     domainsIntent.putExtra("ssl_issued_to_cname", issuedToCName);
1910                     domainsIntent.putExtra("ssl_issued_to_oname", issuedToOName);
1911                     domainsIntent.putExtra("ssl_issued_to_uname", issuedToUName);
1912                     domainsIntent.putExtra("ssl_issued_by_cname", issuedByCName);
1913                     domainsIntent.putExtra("ssl_issued_by_oname", issuedByOName);
1914                     domainsIntent.putExtra("ssl_issued_by_uname", issuedByUName);
1915                     domainsIntent.putExtra("ssl_start_date", startDateLong);
1916                     domainsIntent.putExtra("ssl_end_date", endDateLong);
1917                 }
1918
1919                 // Make it so.
1920                 startActivity(domainsIntent);
1921             }
1922
1923             // Consume the event.
1924             return true;
1925         } else if (menuItemId == R.id.ad_consent) {  // Ad consent.
1926             // Instantiate the ad consent dialog.
1927             DialogFragment adConsentDialogFragment = new AdConsentDialog();
1928
1929             // Display the ad consent dialog.
1930             adConsentDialogFragment.show(getSupportFragmentManager(), getString(R.string.ad_consent));
1931
1932             // Consume the event.
1933             return true;
1934         } else {  // There is no match with the options menu.  Pass the event up to the parent method.
1935             // Don't consume the event.
1936             return super.onOptionsItemSelected(menuItem);
1937         }
1938     }
1939
1940     // removeAllCookies is deprecated, but it is required for API < 21.
1941     @Override
1942     public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
1943         // Get a handle for the shared preferences.
1944         SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
1945
1946         // Get the menu item ID.
1947         int menuItemId = menuItem.getItemId();
1948
1949         // Run the commands that correspond to the selected menu item.
1950         if (menuItemId == R.id.clear_and_exit) {  // Clear and exit.
1951             // Clear and exit Privacy Browser.
1952             clearAndExit();
1953         } else if (menuItemId == R.id.home) {  // Home.
1954             // Load the homepage.
1955             loadUrl(currentWebView, sharedPreferences.getString("homepage", getString(R.string.homepage_default_value)));
1956         } else if (menuItemId == R.id.back) {  // Back.
1957             // Check if the WebView can go back.
1958             if (currentWebView.canGoBack()) {
1959                 // Get the current web back forward list.
1960                 WebBackForwardList webBackForwardList = currentWebView.copyBackForwardList();
1961
1962                 // Get the previous entry URL.
1963                 String previousUrl = webBackForwardList.getItemAtIndex(webBackForwardList.getCurrentIndex() - 1).getUrl();
1964
1965                 // Apply the domain settings.
1966                 applyDomainSettings(currentWebView, previousUrl, false, false, false);
1967
1968                 // Load the previous website in the history.
1969                 currentWebView.goBack();
1970             }
1971         } else if (menuItemId == R.id.forward) {  // Forward.
1972             // Check if the WebView can go forward.
1973             if (currentWebView.canGoForward()) {
1974                 // Get the current web back forward list.
1975                 WebBackForwardList webBackForwardList = currentWebView.copyBackForwardList();
1976
1977                 // Get the next entry URL.
1978                 String nextUrl = webBackForwardList.getItemAtIndex(webBackForwardList.getCurrentIndex() + 1).getUrl();
1979
1980                 // Apply the domain settings.
1981                 applyDomainSettings(currentWebView, nextUrl, false, false, false);
1982
1983                 // Load the next website in the history.
1984                 currentWebView.goForward();
1985             }
1986         } else if (menuItemId == R.id.history) {  // History.
1987             // Instantiate the URL history dialog.
1988             DialogFragment urlHistoryDialogFragment = UrlHistoryDialog.loadBackForwardList(currentWebView.getWebViewFragmentId());
1989
1990             // Show the URL history dialog.
1991             urlHistoryDialogFragment.show(getSupportFragmentManager(), getString(R.string.history));
1992         } else if (menuItemId == R.id.open) {  // Open.
1993             // Instantiate the open file dialog.
1994             DialogFragment openDialogFragment = new OpenDialog();
1995
1996             // Show the open file dialog.
1997             openDialogFragment.show(getSupportFragmentManager(), getString(R.string.open));
1998         } else if (menuItemId == R.id.requests) {  // Requests.
1999             // Populate the resource requests.
2000             RequestsActivity.resourceRequests = currentWebView.getResourceRequests();
2001
2002             // Create an intent to launch the Requests activity.
2003             Intent requestsIntent = new Intent(this, RequestsActivity.class);
2004
2005             // Add the block third-party requests status to the intent.
2006             requestsIntent.putExtra("block_all_third_party_requests", currentWebView.getBlockAllThirdPartyRequests());
2007
2008             // Make it so.
2009             startActivity(requestsIntent);
2010         } else if (menuItemId == R.id.downloads) {  // Downloads.
2011             // Try the default system download manager.
2012             try {
2013                 // Launch the default system Download Manager.
2014                 Intent defaultDownloadManagerIntent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
2015
2016                 // Launch as a new task so that the download manager and Privacy Browser show as separate windows in the recent tasks list.
2017                 defaultDownloadManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
2018
2019                 // Make it so.
2020                 startActivity(defaultDownloadManagerIntent);
2021             } catch (Exception defaultDownloadManagerException) {
2022                 // Try a generic file manager.
2023                 try {
2024                     // Create a generic file manager intent.
2025                     Intent genericFileManagerIntent = new Intent(Intent.ACTION_VIEW);
2026
2027                     // Open the download directory.
2028                     genericFileManagerIntent.setDataAndType(Uri.parse(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString()), DocumentsContract.Document.MIME_TYPE_DIR);
2029
2030                     // Launch as a new task so that the file manager and Privacy Browser show as separate windows in the recent tasks list.
2031                     genericFileManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
2032
2033                     // Make it so.
2034                     startActivity(genericFileManagerIntent);
2035                 } catch (Exception genericFileManagerException) {
2036                     // Try an alternate file manager.
2037                     try {
2038                         // Create an alternate file manager intent.
2039                         Intent alternateFileManagerIntent = new Intent(Intent.ACTION_VIEW);
2040
2041                         // Open the download directory.
2042                         alternateFileManagerIntent.setDataAndType(Uri.parse(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString()), "resource/folder");
2043
2044                         // Launch as a new task so that the file manager and Privacy Browser show as separate windows in the recent tasks list.
2045                         alternateFileManagerIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
2046
2047                         // Open the alternate file manager.
2048                         startActivity(alternateFileManagerIntent);
2049                     } catch (Exception alternateFileManagerException) {
2050                         // Display a snackbar.
2051                         Snackbar.make(currentWebView, R.string.no_file_manager_detected, Snackbar.LENGTH_INDEFINITE).show();
2052                     }
2053                 }
2054             }
2055         } else if (menuItemId == R.id.domains) {  // Domains.
2056             // Set the flag to reapply the domain settings on restart when returning from Domain Settings.
2057             reapplyDomainSettingsOnRestart = true;
2058
2059             // Launch the domains activity.
2060             Intent domainsIntent = new Intent(this, DomainsActivity.class);
2061
2062             // Add the extra information to the intent.
2063             domainsIntent.putExtra("current_url", currentWebView.getUrl());
2064             domainsIntent.putExtra("current_ip_addresses", currentWebView.getCurrentIpAddresses());
2065
2066             // Get the current certificate.
2067             SslCertificate sslCertificate = currentWebView.getCertificate();
2068
2069             // Check to see if the SSL certificate is populated.
2070             if (sslCertificate != null) {
2071                 // Extract the certificate to strings.
2072                 String issuedToCName = sslCertificate.getIssuedTo().getCName();
2073                 String issuedToOName = sslCertificate.getIssuedTo().getOName();
2074                 String issuedToUName = sslCertificate.getIssuedTo().getUName();
2075                 String issuedByCName = sslCertificate.getIssuedBy().getCName();
2076                 String issuedByOName = sslCertificate.getIssuedBy().getOName();
2077                 String issuedByUName = sslCertificate.getIssuedBy().getUName();
2078                 long startDateLong = sslCertificate.getValidNotBeforeDate().getTime();
2079                 long endDateLong = sslCertificate.getValidNotAfterDate().getTime();
2080
2081                 // Add the certificate to the intent.
2082                 domainsIntent.putExtra("ssl_issued_to_cname", issuedToCName);
2083                 domainsIntent.putExtra("ssl_issued_to_oname", issuedToOName);
2084                 domainsIntent.putExtra("ssl_issued_to_uname", issuedToUName);
2085                 domainsIntent.putExtra("ssl_issued_by_cname", issuedByCName);
2086                 domainsIntent.putExtra("ssl_issued_by_oname", issuedByOName);
2087                 domainsIntent.putExtra("ssl_issued_by_uname", issuedByUName);
2088                 domainsIntent.putExtra("ssl_start_date", startDateLong);
2089                 domainsIntent.putExtra("ssl_end_date", endDateLong);
2090             }
2091
2092             // Make it so.
2093             startActivity(domainsIntent);
2094         } else if (menuItemId == R.id.settings) {  // Settings.
2095             // Set the flag to reapply app settings on restart when returning from Settings.
2096             reapplyAppSettingsOnRestart = true;
2097
2098             // Set the flag to reapply the domain settings on restart when returning from Settings.
2099             reapplyDomainSettingsOnRestart = true;
2100
2101             // Launch the settings activity.
2102             Intent settingsIntent = new Intent(this, SettingsActivity.class);
2103             startActivity(settingsIntent);
2104         } else if (menuItemId == R.id.import_export) { // Import/Export.
2105             // Create an intent to launch the import/export activity.
2106             Intent importExportIntent = new Intent(this, ImportExportActivity.class);
2107
2108             // Make it so.
2109             startActivity(importExportIntent);
2110         } else if (menuItemId == R.id.logcat) {  // Logcat.
2111             // Create an intent to launch the logcat activity.
2112             Intent logcatIntent = new Intent(this, LogcatActivity.class);
2113
2114             // Make it so.
2115             startActivity(logcatIntent);
2116         } else if (menuItemId == R.id.guide) {  // Guide.
2117             // Create an intent to launch the guide activity.
2118             Intent guideIntent = new Intent(this, GuideActivity.class);
2119
2120             // Make it so.
2121             startActivity(guideIntent);
2122         } else if (menuItemId == R.id.about) {  // About
2123             // Create an intent to launch the about activity.
2124             Intent aboutIntent = new Intent(this, AboutActivity.class);
2125
2126             // Create a string array for the blocklist versions.
2127             String[] blocklistVersions = new String[]{easyList.get(0).get(0)[0], easyPrivacy.get(0).get(0)[0], fanboysAnnoyanceList.get(0).get(0)[0], fanboysSocialList.get(0).get(0)[0],
2128                     ultraList.get(0).get(0)[0], ultraPrivacy.get(0).get(0)[0]};
2129
2130             // Add the blocklist versions to the intent.
2131             aboutIntent.putExtra(AboutActivity.BLOCKLIST_VERSIONS, blocklistVersions);
2132
2133             // Make it so.
2134             startActivity(aboutIntent);
2135         }
2136
2137         // Close the navigation drawer.
2138         drawerLayout.closeDrawer(GravityCompat.START);
2139         return true;
2140     }
2141
2142     @Override
2143     public void onPostCreate(Bundle savedInstanceState) {
2144         // Run the default commands.
2145         super.onPostCreate(savedInstanceState);
2146
2147         // Sync the state of the DrawerToggle after the default `onRestoreInstanceState()` has finished.  This creates the navigation drawer icon.
2148         actionBarDrawerToggle.syncState();
2149     }
2150
2151     @Override
2152     public void onConfigurationChanged(@NonNull Configuration newConfig) {
2153         // Run the default commands.
2154         super.onConfigurationChanged(newConfig);
2155
2156         // Reload the ad for the free flavor if not in full screen mode.
2157         if (BuildConfig.FLAVOR.contentEquals("free") && !inFullScreenBrowsingMode) {
2158             // Get a handle for the ad view.  This cannot be a class variable because it changes with each ad load.
2159             View adView = findViewById(R.id.adview);
2160
2161             // Reload the ad.  The AdView is destroyed and recreated, which changes the ID, every time it is reloaded to handle possible rotations.
2162             // `getContext()` can be used instead of `getActivity.getApplicationContext()` once the minimum API >= 23.
2163             AdHelper.loadAd(adView, getApplicationContext(), this, getString(R.string.ad_unit_id));
2164         }
2165
2166         // `invalidateOptionsMenu` should recalculate the number of action buttons from the menu to display on the app bar, but it doesn't because of the this bug:
2167         // https://code.google.com/p/android/issues/detail?id=20493#c8
2168         // ActivityCompat.invalidateOptionsMenu(this);
2169     }
2170
2171     @Override
2172     public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
2173         // Get the hit test result.
2174         final WebView.HitTestResult hitTestResult = currentWebView.getHitTestResult();
2175
2176         // Define the URL strings.
2177         final String imageUrl;
2178         final String linkUrl;
2179
2180         // Get handles for the system managers.
2181         final ClipboardManager clipboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
2182
2183         // Remove the lint errors below that the clipboard manager might be null.
2184         assert clipboardManager != null;
2185
2186         // Process the link according to the type.
2187         switch (hitTestResult.getType()) {
2188             // `SRC_ANCHOR_TYPE` is a link.
2189             case WebView.HitTestResult.SRC_ANCHOR_TYPE:
2190                 // Get the target URL.
2191                 linkUrl = hitTestResult.getExtra();
2192
2193                 // Set the target URL as the title of the `ContextMenu`.
2194                 menu.setHeaderTitle(linkUrl);
2195
2196                 // Add an Open in New Tab entry.
2197                 menu.add(R.string.open_in_new_tab).setOnMenuItemClickListener((MenuItem item) -> {
2198                     // Load the link URL in a new tab and move to it.
2199                     addNewTab(linkUrl, true);
2200
2201                     // Consume the event.
2202                     return true;
2203                 });
2204
2205                 // Add an Open in Background entry.
2206                 menu.add(R.string.open_in_background).setOnMenuItemClickListener((MenuItem item) -> {
2207                     // Load the link URL in a new tab but do not move to it.
2208                     addNewTab(linkUrl, false);
2209
2210                     // Consume the event.
2211                     return true;
2212                 });
2213
2214                 // Add an Open with App entry.
2215                 menu.add(R.string.open_with_app).setOnMenuItemClickListener((MenuItem item) -> {
2216                     openWithApp(linkUrl);
2217
2218                     // Consume the event.
2219                     return true;
2220                 });
2221
2222                 // Add an Open with Browser entry.
2223                 menu.add(R.string.open_with_browser).setOnMenuItemClickListener((MenuItem item) -> {
2224                     openWithBrowser(linkUrl);
2225
2226                     // Consume the event.
2227                     return true;
2228                 });
2229
2230                 // Add a Copy URL entry.
2231                 menu.add(R.string.copy_url).setOnMenuItemClickListener((MenuItem item) -> {
2232                     // Save the link URL in a `ClipData`.
2233                     ClipData srcAnchorTypeClipData = ClipData.newPlainText(getString(R.string.url), linkUrl);
2234
2235                     // Set the `ClipData` as the clipboard's primary clip.
2236                     clipboardManager.setPrimaryClip(srcAnchorTypeClipData);
2237
2238                     // Consume the event.
2239                     return true;
2240                 });
2241
2242                 // Add a Save URL entry.
2243                 menu.add(R.string.save_url).setOnMenuItemClickListener((MenuItem item) -> {
2244                     // Check the download preference.
2245                     if (downloadWithExternalApp) {  // Download with an external app.
2246                         downloadUrlWithExternalApp(linkUrl);
2247                     } else {  // Handle the download inside of Privacy Browser.
2248                         // Prepare the save dialog.  The dialog will be displayed once the file size and the content disposition have been acquired.
2249                         new PrepareSaveDialog(this, this, getSupportFragmentManager(), SaveWebpageDialog.SAVE_URL, currentWebView.getSettings().getUserAgentString(),
2250                                 currentWebView.getAcceptCookies()).execute(linkUrl);
2251                     }
2252
2253                     // Consume the event.
2254                     return true;
2255                 });
2256
2257                 // Add an empty Cancel entry, which by default closes the context menu.
2258                 menu.add(R.string.cancel);
2259                 break;
2260
2261             // `IMAGE_TYPE` is an image.
2262             case WebView.HitTestResult.IMAGE_TYPE:
2263                 // Get the image URL.
2264                 imageUrl = hitTestResult.getExtra();
2265
2266                 // Remove the incorrect lint warning below that the image URL might be null.
2267                 assert imageUrl != null;
2268
2269                 // Set the context menu title.
2270                 if (imageUrl.startsWith("data:")) {  // The image data is contained in within the URL, making it exceedingly long.
2271                     // Truncate the image URL before making it the title.
2272                     menu.setHeaderTitle(imageUrl.substring(0, 100));
2273                 } else {  // The image URL does not contain the full image data.
2274                     // Set the image URL as the title of the context menu.
2275                     menu.setHeaderTitle(imageUrl);
2276                 }
2277
2278                 // Add an Open in New Tab entry.
2279                 menu.add(R.string.open_image_in_new_tab).setOnMenuItemClickListener((MenuItem item) -> {
2280                     // Load the image in a new tab.
2281                     addNewTab(imageUrl, true);
2282
2283                     // Consume the event.
2284                     return true;
2285                 });
2286
2287                 // Add an Open with App entry.
2288                 menu.add(R.string.open_with_app).setOnMenuItemClickListener((MenuItem item) -> {
2289                     // Open the image URL with an external app.
2290                     openWithApp(imageUrl);
2291
2292                     // Consume the event.
2293                     return true;
2294                 });
2295
2296                 // Add an Open with Browser entry.
2297                 menu.add(R.string.open_with_browser).setOnMenuItemClickListener((MenuItem item) -> {
2298                     // Open the image URL with an external browser.
2299                     openWithBrowser(imageUrl);
2300
2301                     // Consume the event.
2302                     return true;
2303                 });
2304
2305                 // Add a View Image entry.
2306                 menu.add(R.string.view_image).setOnMenuItemClickListener(item -> {
2307                     // Load the image in the current tab.
2308                     loadUrl(currentWebView, imageUrl);
2309
2310                     // Consume the event.
2311                     return true;
2312                 });
2313
2314                 // Add a Save Image entry.
2315                 menu.add(R.string.save_image).setOnMenuItemClickListener((MenuItem item) -> {
2316                     // Check the download preference.
2317                     if (downloadWithExternalApp) {  // Download with an external app.
2318                         downloadUrlWithExternalApp(imageUrl);
2319                     } else {  // Handle the download inside of Privacy Browser.
2320                         // Prepare the save dialog.  The dialog will be displayed once the file size and the content disposition have been acquired.
2321                         new PrepareSaveDialog(this, this, getSupportFragmentManager(), SaveWebpageDialog.SAVE_URL, currentWebView.getSettings().getUserAgentString(),
2322                                 currentWebView.getAcceptCookies()).execute(imageUrl);
2323                     }
2324
2325                     // Consume the event.
2326                     return true;
2327                 });
2328
2329                 // Add a Copy URL entry.
2330                 menu.add(R.string.copy_url).setOnMenuItemClickListener((MenuItem item) -> {
2331                     // Save the image URL in a clip data.
2332                     ClipData imageTypeClipData = ClipData.newPlainText(getString(R.string.url), imageUrl);
2333
2334                     // Set the clip data as the clipboard's primary clip.
2335                     clipboardManager.setPrimaryClip(imageTypeClipData);
2336
2337                     // Consume the event.
2338                     return true;
2339                 });
2340
2341                 // Add an empty Cancel entry, which by default closes the context menu.
2342                 menu.add(R.string.cancel);
2343                 break;
2344
2345             // `SRC_IMAGE_ANCHOR_TYPE` is an image that is also a link.
2346             case WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE:
2347                 // Get the image URL.
2348                 imageUrl = hitTestResult.getExtra();
2349
2350                 // Instantiate a handler.
2351                 Handler handler = new Handler();
2352
2353                 // Get a message from the handler.
2354                 Message message = handler.obtainMessage();
2355
2356                 // Request the image details from the last touched node be returned in the message.
2357                 currentWebView.requestFocusNodeHref(message);
2358
2359                 // Get the link URL from the message data.
2360                 linkUrl = message.getData().getString("url");
2361
2362                 // Set the link URL as the title of the context menu.
2363                 menu.setHeaderTitle(linkUrl);
2364
2365                 // Add an Open in New Tab entry.
2366                 menu.add(R.string.open_in_new_tab).setOnMenuItemClickListener((MenuItem item) -> {
2367                     // Load the link URL in a new tab and move to it.
2368                     addNewTab(linkUrl, true);
2369
2370                     // Consume the event.
2371                     return true;
2372                 });
2373
2374                 // Add an Open in Background entry.
2375                 menu.add(R.string.open_in_background).setOnMenuItemClickListener((MenuItem item) -> {
2376                     // Lod the link URL in a new tab but do not move to it.
2377                     addNewTab(linkUrl, false);
2378
2379                     // Consume the event.
2380                     return true;
2381                 });
2382
2383                 // Add an Open Image in New Tab entry.
2384                 menu.add(R.string.open_image_in_new_tab).setOnMenuItemClickListener((MenuItem item) -> {
2385                     // Load the image in a new tab and move to it.
2386                     addNewTab(imageUrl, true);
2387
2388                     // Consume the event.
2389                     return true;
2390                 });
2391
2392                 // Add an Open with App entry.
2393                 menu.add(R.string.open_with_app).setOnMenuItemClickListener((MenuItem item) -> {
2394                     // Open the link URL with an external app.
2395                     openWithApp(linkUrl);
2396
2397                     // Consume the event.
2398                     return true;
2399                 });
2400
2401                 // Add an Open with Browser entry.
2402                 menu.add(R.string.open_with_browser).setOnMenuItemClickListener((MenuItem item) -> {
2403                     // Open the link URL with an external browser.
2404                     openWithBrowser(linkUrl);
2405
2406                     // Consume the event.
2407                     return true;
2408                 });
2409
2410                 // Add a View Image entry.
2411                 menu.add(R.string.view_image).setOnMenuItemClickListener((MenuItem item) -> {
2412                    // View the image in the current tab.
2413                    loadUrl(currentWebView, imageUrl);
2414
2415                    // Consume the event.
2416                    return true;
2417                 });
2418
2419                 // Add a Save Image entry.
2420                 menu.add(R.string.save_image).setOnMenuItemClickListener((MenuItem item) -> {
2421                     // Check the download preference.
2422                     if (downloadWithExternalApp) {  // Download with an external app.
2423                         downloadUrlWithExternalApp(imageUrl);
2424                     } else {  // Handle the download inside of Privacy Browser.
2425                         // Prepare the save dialog.  The dialog will be displayed once the file size and the content disposition have been acquired.
2426                         new PrepareSaveDialog(this, this, getSupportFragmentManager(), SaveWebpageDialog.SAVE_URL, currentWebView.getSettings().getUserAgentString(),
2427                                 currentWebView.getAcceptCookies()).execute(imageUrl);
2428                     }
2429
2430                     // Consume the event.
2431                     return true;
2432                 });
2433
2434                 // Add a Copy URL entry.
2435                 menu.add(R.string.copy_url).setOnMenuItemClickListener((MenuItem item) -> {
2436                     // Save the link URL in a clip data.
2437                     ClipData srcImageAnchorTypeClipData = ClipData.newPlainText(getString(R.string.url), linkUrl);
2438
2439                     // Set the clip data as the clipboard's primary clip.
2440                     clipboardManager.setPrimaryClip(srcImageAnchorTypeClipData);
2441
2442                     // Consume the event.
2443                     return true;
2444                 });
2445
2446                 // Add a Save URL entry.
2447                 menu.add(R.string.save_url).setOnMenuItemClickListener((MenuItem item) -> {
2448                     // Check the download preference.
2449                     if (downloadWithExternalApp) {  // Download with an external app.
2450                         downloadUrlWithExternalApp(linkUrl);
2451                     } else {  // Handle the download inside of Privacy Browser.
2452                         // Prepare the save dialog.  The dialog will be displayed once the file size and the content disposition have been acquired.
2453                         new PrepareSaveDialog(this, this, getSupportFragmentManager(), SaveWebpageDialog.SAVE_URL, currentWebView.getSettings().getUserAgentString(),
2454                                 currentWebView.getAcceptCookies()).execute(linkUrl);
2455                     }
2456
2457                     // Consume the event.
2458                     return true;
2459                 });
2460
2461                 // Add an empty Cancel entry, which by default closes the context menu.
2462                 menu.add(R.string.cancel);
2463                 break;
2464
2465             case WebView.HitTestResult.EMAIL_TYPE:
2466                 // Get the target URL.
2467                 linkUrl = hitTestResult.getExtra();
2468
2469                 // Set the target URL as the title of the `ContextMenu`.
2470                 menu.setHeaderTitle(linkUrl);
2471
2472                 // Add a Write Email entry.
2473                 menu.add(R.string.write_email).setOnMenuItemClickListener(item -> {
2474                     // Use `ACTION_SENDTO` instead of `ACTION_SEND` so that only email programs are launched.
2475                     Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
2476
2477                     // Parse the url and set it as the data for the `Intent`.
2478                     emailIntent.setData(Uri.parse("mailto:" + linkUrl));
2479
2480                     // `FLAG_ACTIVITY_NEW_TASK` opens the email program in a new task instead as part of Privacy Browser.
2481                     emailIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
2482
2483                     try {
2484                         // Make it so.
2485                         startActivity(emailIntent);
2486                     } catch (ActivityNotFoundException exception) {
2487                         // Display a snackbar.
2488                         Snackbar.make(currentWebView, getString(R.string.error) + "  " + exception, Snackbar.LENGTH_INDEFINITE).show();
2489                     }
2490
2491                     // Consume the event.
2492                     return true;
2493                 });
2494
2495                 // Add a Copy Email Address entry.
2496                 menu.add(R.string.copy_email_address).setOnMenuItemClickListener(item -> {
2497                     // Save the email address in a `ClipData`.
2498                     ClipData srcEmailTypeClipData = ClipData.newPlainText(getString(R.string.email_address), linkUrl);
2499
2500                     // Set the `ClipData` as the clipboard's primary clip.
2501                     clipboardManager.setPrimaryClip(srcEmailTypeClipData);
2502
2503                     // Consume the event.
2504                     return true;
2505                 });
2506
2507                 // Add an empty Cancel entry, which by default closes the context menu.
2508                 menu.add(R.string.cancel);
2509                 break;
2510         }
2511     }
2512
2513     @Override
2514     public void onCreateBookmark(DialogFragment dialogFragment, Bitmap favoriteIconBitmap) {
2515         // Get a handle for the bookmarks list view.
2516         ListView bookmarksListView = findViewById(R.id.bookmarks_drawer_listview);
2517
2518         // Get the dialog.
2519         Dialog dialog = dialogFragment.getDialog();
2520
2521         // Remove the incorrect lint warning below that the dialog might be null.
2522         assert dialog != null;
2523
2524         // Get the views from the dialog fragment.
2525         EditText createBookmarkNameEditText = dialog.findViewById(R.id.create_bookmark_name_edittext);
2526         EditText createBookmarkUrlEditText = dialog.findViewById(R.id.create_bookmark_url_edittext);
2527
2528         // Extract the strings from the edit texts.
2529         String bookmarkNameString = createBookmarkNameEditText.getText().toString();
2530         String bookmarkUrlString = createBookmarkUrlEditText.getText().toString();
2531
2532         // Create a favorite icon byte array output stream.
2533         ByteArrayOutputStream favoriteIconByteArrayOutputStream = new ByteArrayOutputStream();
2534
2535         // Convert the favorite icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
2536         favoriteIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, favoriteIconByteArrayOutputStream);
2537
2538         // Convert the favorite icon byte array stream to a byte array.
2539         byte[] favoriteIconByteArray = favoriteIconByteArrayOutputStream.toByteArray();
2540
2541         // Display the new bookmark below the current items in the (0 indexed) list.
2542         int newBookmarkDisplayOrder = bookmarksListView.getCount();
2543
2544         // Create the bookmark.
2545         bookmarksDatabaseHelper.createBookmark(bookmarkNameString, bookmarkUrlString, currentBookmarksFolder, newBookmarkDisplayOrder, favoriteIconByteArray);
2546
2547         // Update the bookmarks cursor with the current contents of this folder.
2548         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentBookmarksFolder);
2549
2550         // Update the list view.
2551         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
2552
2553         // Scroll to the new bookmark.
2554         bookmarksListView.setSelection(newBookmarkDisplayOrder);
2555     }
2556
2557     @Override
2558     public void onCreateBookmarkFolder(DialogFragment dialogFragment, @NonNull Bitmap favoriteIconBitmap) {
2559         // Get a handle for the bookmarks list view.
2560         ListView bookmarksListView = findViewById(R.id.bookmarks_drawer_listview);
2561
2562         // Get the dialog.
2563         Dialog dialog = dialogFragment.getDialog();
2564
2565         // Remove the incorrect lint warning below that the dialog might be null.
2566         assert dialog != null;
2567
2568         // Get handles for the views in the dialog fragment.
2569         EditText folderNameEditText = dialog.findViewById(R.id.folder_name_edittext);
2570         RadioButton defaultIconRadioButton = dialog.findViewById(R.id.default_icon_radiobutton);
2571         ImageView defaultIconImageView = dialog.findViewById(R.id.default_icon_imageview);
2572
2573         // Get new folder name string.
2574         String folderNameString = folderNameEditText.getText().toString();
2575
2576         // Create a folder icon bitmap.
2577         Bitmap folderIconBitmap;
2578
2579         // Set the folder icon bitmap according to the dialog.
2580         if (defaultIconRadioButton.isChecked()) {  // Use the default folder icon.
2581             // Get the default folder icon drawable.
2582             Drawable folderIconDrawable = defaultIconImageView.getDrawable();
2583
2584             // Convert the folder icon drawable to a bitmap drawable.
2585             BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
2586
2587             // Convert the folder icon bitmap drawable to a bitmap.
2588             folderIconBitmap = folderIconBitmapDrawable.getBitmap();
2589         } else {  // Use the WebView favorite icon.
2590             // Copy the favorite icon bitmap to the folder icon bitmap.
2591             folderIconBitmap = favoriteIconBitmap;
2592         }
2593
2594         // Create a folder icon byte array output stream.
2595         ByteArrayOutputStream folderIconByteArrayOutputStream = new ByteArrayOutputStream();
2596
2597         // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
2598         folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, folderIconByteArrayOutputStream);
2599
2600         // Convert the folder icon byte array stream to a byte array.
2601         byte[] folderIconByteArray = folderIconByteArrayOutputStream.toByteArray();
2602
2603         // Move all the bookmarks down one in the display order.
2604         for (int i = 0; i < bookmarksListView.getCount(); i++) {
2605             int databaseId = (int) bookmarksListView.getItemIdAtPosition(i);
2606             bookmarksDatabaseHelper.updateDisplayOrder(databaseId, i + 1);
2607         }
2608
2609         // Create the folder, which will be placed at the top of the `ListView`.
2610         bookmarksDatabaseHelper.createFolder(folderNameString, currentBookmarksFolder, folderIconByteArray);
2611
2612         // Update the bookmarks cursor with the current contents of this folder.
2613         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentBookmarksFolder);
2614
2615         // Update the `ListView`.
2616         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
2617
2618         // Scroll to the new folder.
2619         bookmarksListView.setSelection(0);
2620     }
2621
2622     @Override
2623     public void onSaveBookmarkFolder(DialogFragment dialogFragment, int selectedFolderDatabaseId, @NonNull Bitmap favoriteIconBitmap) {
2624         // Remove the incorrect lint warning below that the dialog fragment might be null.
2625         assert dialogFragment != null;
2626
2627         // Get the dialog.
2628         Dialog dialog = dialogFragment.getDialog();
2629
2630         // Remove the incorrect lint warning below that the dialog might be null.
2631         assert dialog != null;
2632
2633         // Get handles for the views from the dialog.
2634         RadioButton currentFolderIconRadioButton = dialog.findViewById(R.id.current_icon_radiobutton);
2635         RadioButton defaultFolderIconRadioButton = dialog.findViewById(R.id.default_icon_radiobutton);
2636         ImageView defaultFolderIconImageView = dialog.findViewById(R.id.default_icon_imageview);
2637         EditText editFolderNameEditText = dialog.findViewById(R.id.folder_name_edittext);
2638
2639         // Get the new folder name.
2640         String newFolderNameString = editFolderNameEditText.getText().toString();
2641
2642         // Check if the favorite icon has changed.
2643         if (currentFolderIconRadioButton.isChecked()) {  // Only the name has changed.
2644             // Update the name in the database.
2645             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString);
2646         } else if (!currentFolderIconRadioButton.isChecked() && newFolderNameString.equals(oldFolderNameString)) {  // Only the icon has changed.
2647             // Create the new folder icon Bitmap.
2648             Bitmap folderIconBitmap;
2649
2650             // Populate the new folder icon bitmap.
2651             if (defaultFolderIconRadioButton.isChecked()) {
2652                 // Get the default folder icon drawable.
2653                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
2654
2655                 // Convert the folder icon drawable to a bitmap drawable.
2656                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
2657
2658                 // Convert the folder icon bitmap drawable to a bitmap.
2659                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
2660             } else {  // Use the `WebView` favorite icon.
2661                 // Copy the favorite icon bitmap to the folder icon bitmap.
2662                 folderIconBitmap = favoriteIconBitmap;
2663             }
2664
2665             // Create a folder icon byte array output stream.
2666             ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
2667
2668             // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
2669             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
2670
2671             // Convert the folder icon byte array stream to a byte array.
2672             byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
2673
2674             // Update the folder icon in the database.
2675             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, newFolderIconByteArray);
2676         } else {  // The folder icon and the name have changed.
2677             // Get the new folder icon bitmap.
2678             Bitmap folderIconBitmap;
2679             if (defaultFolderIconRadioButton.isChecked()) {
2680                 // Get the default folder icon drawable.
2681                 Drawable folderIconDrawable = defaultFolderIconImageView.getDrawable();
2682
2683                 // Convert the folder icon drawable to a bitmap drawable.
2684                 BitmapDrawable folderIconBitmapDrawable = (BitmapDrawable) folderIconDrawable;
2685
2686                 // Convert the folder icon bitmap drawable to a bitmap.
2687                 folderIconBitmap = folderIconBitmapDrawable.getBitmap();
2688             } else {  // Use the `WebView` favorite icon.
2689                 // Copy the favorite icon bitmap to the folder icon bitmap.
2690                 folderIconBitmap = favoriteIconBitmap;
2691             }
2692
2693             // Create a folder icon byte array output stream.
2694             ByteArrayOutputStream newFolderIconByteArrayOutputStream = new ByteArrayOutputStream();
2695
2696             // Convert the folder icon bitmap to a byte array.  `0` is for lossless compression (the only option for a PNG).
2697             folderIconBitmap.compress(Bitmap.CompressFormat.PNG, 0, newFolderIconByteArrayOutputStream);
2698
2699             // Convert the folder icon byte array stream to a byte array.
2700             byte[] newFolderIconByteArray = newFolderIconByteArrayOutputStream.toByteArray();
2701
2702             // Update the folder name and icon in the database.
2703             bookmarksDatabaseHelper.updateFolder(selectedFolderDatabaseId, oldFolderNameString, newFolderNameString, newFolderIconByteArray);
2704         }
2705
2706         // Update the bookmarks cursor with the current contents of this folder.
2707         bookmarksCursor = bookmarksDatabaseHelper.getBookmarksByDisplayOrder(currentBookmarksFolder);
2708
2709         // Update the `ListView`.
2710         bookmarksCursorAdapter.changeCursor(bookmarksCursor);
2711     }
2712
2713     // Override `onBackPressed()` to handle the navigation drawer and and the WebViews.
2714     @Override
2715     public void onBackPressed() {
2716         // Check the different options for processing `back`.
2717         if (drawerLayout.isDrawerVisible(GravityCompat.START)) {  // The navigation drawer is open.
2718             // Close the navigation drawer.
2719             drawerLayout.closeDrawer(GravityCompat.START);
2720         } else if (drawerLayout.isDrawerVisible(GravityCompat.END)){  // The bookmarks drawer is open.
2721             // close the bookmarks drawer.
2722             drawerLayout.closeDrawer(GravityCompat.END);
2723         } else if (displayingFullScreenVideo) {  // A full screen video is shown.
2724             // Exit the full screen video.
2725             exitFullScreenVideo();
2726         } else if (currentWebView.canGoBack()) {  // There is at least one item in the current WebView history.
2727             // Get the current web back forward list.
2728             WebBackForwardList webBackForwardList = currentWebView.copyBackForwardList();
2729
2730             // Get the previous entry URL.
2731             String previousUrl = webBackForwardList.getItemAtIndex(webBackForwardList.getCurrentIndex() - 1).getUrl();
2732
2733             // Apply the domain settings.
2734             applyDomainSettings(currentWebView, previousUrl, false, false, false);
2735
2736             // Go back.
2737             currentWebView.goBack();
2738         } else if (tabLayout.getTabCount() > 1) {  // There are at least two tabs.
2739             // Close the current tab.
2740             closeCurrentTab();
2741         } else {  // There isn't anything to do in Privacy Browser.
2742             // Close Privacy Browser.  `finishAndRemoveTask()` also removes Privacy Browser from the recent app list.
2743             if (Build.VERSION.SDK_INT >= 21) {
2744                 finishAndRemoveTask();
2745             } else {
2746                 finish();
2747             }
2748
2749             // Manually kill Privacy Browser.  Otherwise, it is glitchy when restarted.
2750             System.exit(0);
2751         }
2752     }
2753
2754     // Process the results of a file browse.
2755     @Override
2756     public void onActivityResult(int requestCode, int resultCode, Intent returnedIntent) {
2757         // Run the default commands.
2758         super.onActivityResult(requestCode, resultCode, returnedIntent);
2759
2760         // Run the commands that correlate to the specified request code.
2761         switch (requestCode) {
2762             case BROWSE_FILE_UPLOAD_REQUEST_CODE:
2763                 // File uploads only work on API >= 21.
2764                 if (Build.VERSION.SDK_INT >= 21) {
2765                     // Pass the file to the WebView.
2766                     fileChooserCallback.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, returnedIntent));
2767                 }
2768                 break;
2769
2770             case BROWSE_OPEN_REQUEST_CODE:
2771                 // Don't do anything if the user pressed back from the file picker.
2772                 if (resultCode == Activity.RESULT_OK) {
2773                     // Get a handle for the open dialog fragment.
2774                     DialogFragment openDialogFragment = (DialogFragment) getSupportFragmentManager().findFragmentByTag(getString(R.string.open));
2775
2776                     // Only update the file name if the dialog still exists.
2777                     if (openDialogFragment != null) {
2778                         // Get a handle for the open dialog.
2779                         Dialog openDialog = openDialogFragment.getDialog();
2780
2781                         // Remove the incorrect lint warning below that the dialog might be null.
2782                         assert openDialog != null;
2783
2784                         // Get a handle for the file name edit text.
2785                         EditText fileNameEditText = openDialog.findViewById(R.id.file_name_edittext);
2786
2787                         // Get the file name URI from the intent.
2788                         Uri fileNameUri = returnedIntent.getData();
2789
2790                         // Get the file name string from the URI.
2791                         String fileNameString = fileNameUri.toString();
2792
2793                         // Set the file name text.
2794                         fileNameEditText.setText(fileNameString);
2795
2796                         // Move the cursor to the end of the file name edit text.
2797                         fileNameEditText.setSelection(fileNameString.length());
2798                     }
2799                 }
2800                 break;
2801
2802             case BROWSE_SAVE_WEBPAGE_REQUEST_CODE:
2803                 // Don't do anything if the user pressed back from the file picker.
2804                 if (resultCode == Activity.RESULT_OK) {
2805                     // Get a handle for the save dialog fragment.
2806                     DialogFragment saveWebpageDialogFragment = (DialogFragment) getSupportFragmentManager().findFragmentByTag(getString(R.string.save_dialog));
2807
2808                     // Only update the file name if the dialog still exists.
2809                     if (saveWebpageDialogFragment != null) {
2810                         // Get a handle for the save webpage dialog.
2811                         Dialog saveWebpageDialog = saveWebpageDialogFragment.getDialog();
2812
2813                         // Remove the incorrect lint warning below that the dialog might be null.
2814                         assert saveWebpageDialog != null;
2815
2816                         // Get a handle for the file name edit text.
2817                         EditText fileNameEditText = saveWebpageDialog.findViewById(R.id.file_name_edittext);
2818
2819                         // Get the file name URI from the intent.
2820                         Uri fileNameUri = returnedIntent.getData();
2821
2822                         // Get the file name string from the URI.
2823                         String fileNameString = fileNameUri.toString();
2824
2825                         // Set the file name text.
2826                         fileNameEditText.setText(fileNameString);
2827
2828                         // Move the cursor to the end of the file name edit text.
2829                         fileNameEditText.setSelection(fileNameString.length());
2830                     }
2831                 }
2832                 break;
2833         }
2834     }
2835
2836     private void loadUrlFromTextBox() {
2837         // Get the text from urlTextBox and convert it to a string.  trim() removes white spaces from the beginning and end of the string.
2838         String unformattedUrlString = urlEditText.getText().toString().trim();
2839
2840         // Initialize the formatted URL string.
2841         String url = "";
2842
2843         // Check to see if `unformattedUrlString` is a valid URL.  Otherwise, convert it into a search.
2844         if (unformattedUrlString.startsWith("content://")) {  // This is a Content URL.
2845             // Load the entire content URL.
2846             url = unformattedUrlString;
2847         } else if (Patterns.WEB_URL.matcher(unformattedUrlString).matches() || unformattedUrlString.startsWith("http://") || unformattedUrlString.startsWith("https://") ||
2848                 unformattedUrlString.startsWith("file://")) {  // This is a standard URL.
2849             // Add `https://` at the beginning if there is no protocol.  Otherwise the app will segfault.
2850             if (!unformattedUrlString.startsWith("http") && !unformattedUrlString.startsWith("file://") && !unformattedUrlString.startsWith("content://")) {
2851                 unformattedUrlString = "https://" + unformattedUrlString;
2852             }
2853
2854             // Initialize `unformattedUrl`.
2855             URL unformattedUrl = null;
2856
2857             // Convert `unformattedUrlString` to a `URL`, then to a `URI`, and then back to a `String`, which sanitizes the input and adds in any missing components.
2858             try {
2859                 unformattedUrl = new URL(unformattedUrlString);
2860             } catch (MalformedURLException e) {
2861                 e.printStackTrace();
2862             }
2863
2864             // The ternary operator (? :) makes sure that a null pointer exception is not thrown, which would happen if `.get` was called on a `null` value.
2865             String scheme = unformattedUrl != null ? unformattedUrl.getProtocol() : null;
2866             String authority = unformattedUrl != null ? unformattedUrl.getAuthority() : null;
2867             String path = unformattedUrl != null ? unformattedUrl.getPath() : null;
2868             String query = unformattedUrl != null ? unformattedUrl.getQuery() : null;
2869             String fragment = unformattedUrl != null ? unformattedUrl.getRef() : null;
2870
2871             // Build the URI.
2872             Uri.Builder uri = new Uri.Builder();
2873             uri.scheme(scheme).authority(authority).path(path).query(query).fragment(fragment);
2874
2875             // Decode the URI as a UTF-8 string in.
2876             try {
2877                 url = URLDecoder.decode(uri.build().toString(), "UTF-8");
2878             } catch (UnsupportedEncodingException exception) {
2879                 // Do nothing.  The formatted URL string will remain blank.
2880             }
2881         } else if (!unformattedUrlString.isEmpty()){  // This is not a URL, but rather a search string.
2882             // Create an encoded URL String.
2883             String encodedUrlString;
2884
2885             // Sanitize the search input.
2886             try {
2887                 encodedUrlString = URLEncoder.encode(unformattedUrlString, "UTF-8");
2888             } catch (UnsupportedEncodingException exception) {
2889                 encodedUrlString = "";
2890             }
2891
2892             // Add the base search URL.
2893             url = searchURL + encodedUrlString;
2894         }
2895
2896         // Clear the focus from the URL edit text.  Otherwise, proximate typing in the box will retain the colorized formatting instead of being reset during refocus.
2897         urlEditText.clearFocus();
2898
2899         // Make it so.
2900         loadUrl(currentWebView, url);
2901     }
2902
2903     private void loadUrl(NestedScrollWebView nestedScrollWebView, String url) {
2904         // Sanitize the URL.
2905         url = sanitizeUrl(url);
2906
2907         // Apply the domain settings and load the URL.
2908         applyDomainSettings(nestedScrollWebView, url, true, false, true);
2909     }
2910
2911     public void findPreviousOnPage(View view) {
2912         // Go to the previous highlighted phrase on the page.  `false` goes backwards instead of forwards.
2913         currentWebView.findNext(false);
2914     }
2915
2916     public void findNextOnPage(View view) {
2917         // Go to the next highlighted phrase on the page. `true` goes forwards instead of backwards.
2918         currentWebView.findNext(true);
2919     }
2920
2921     public void closeFindOnPage(View view) {
2922         // Get a handle for the views.
2923         Toolbar toolbar = findViewById(R.id.toolbar);
2924         LinearLayout findOnPageLinearLayout = findViewById(R.id.find_on_page_linearlayout);
2925         EditText findOnPageEditText = findViewById(R.id.find_on_page_edittext);
2926
2927         // Delete the contents of `find_on_page_edittext`.
2928         findOnPageEditText.setText(null);
2929
2930         // Clear the highlighted phrases if the WebView is not null.
2931         if (currentWebView != null) {
2932             currentWebView.clearMatches();
2933         }
2934
2935         // Hide the find on page linear layout.
2936         findOnPageLinearLayout.setVisibility(View.GONE);
2937
2938         // Show the toolbar.
2939         toolbar.setVisibility(View.VISIBLE);
2940
2941         // Get a handle for the input method manager.
2942         InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
2943
2944         // Remove the lint warning below that the input method manager might be null.
2945         assert inputMethodManager != null;
2946
2947         // Hide the keyboard.
2948         inputMethodManager.hideSoftInputFromWindow(toolbar.getWindowToken(), 0);
2949     }
2950
2951     @Override
2952     public void onApplyNewFontSize(DialogFragment dialogFragment) {
2953         // Remove the incorrect lint warning below that the dialog fragment might be null.
2954         assert dialogFragment != null;
2955
2956         // Get the dialog.
2957         Dialog dialog = dialogFragment.getDialog();
2958
2959         // Remove the incorrect lint warning below tha the dialog might be null.
2960         assert dialog != null;
2961
2962         // Get a handle for the font size edit text.
2963         EditText fontSizeEditText = dialog.findViewById(R.id.font_size_edittext);
2964
2965         // Initialize the new font size variable with the current font size.
2966         int newFontSize = currentWebView.getSettings().getTextZoom();
2967
2968         // Get the font size from the edit text.
2969         try {
2970             newFontSize = Integer.parseInt(fontSizeEditText.getText().toString());
2971         } catch (Exception exception) {
2972             // If the edit text does not contain a valid font size do nothing.
2973         }
2974
2975         // Apply the new font size.
2976         currentWebView.getSettings().setTextZoom(newFontSize);
2977     }
2978
2979     @Override
2980     public void onOpen(DialogFragment dialogFragment) {
2981         // Get the dialog.
2982         Dialog dialog = dialogFragment.getDialog();
2983
2984         // Remove the incorrect lint warning below that the dialog might be null.
2985         assert dialog != null;
2986
2987         // Get handles for the views.
2988         EditText fileNameEditText = dialog.findViewById(R.id.file_name_edittext);
2989         CheckBox mhtCheckBox = dialog.findViewById(R.id.mht_checkbox);
2990
2991         // Get the file path string.
2992         String openFilePath = fileNameEditText.getText().toString();
2993
2994         // Apply the domain settings.  This resets the favorite icon and removes any domain settings.
2995         applyDomainSettings(currentWebView, openFilePath, true, false, false);
2996
2997         // Open the file according to the type.
2998         if (mhtCheckBox.isChecked()) {  // Force opening of an MHT file.
2999             try {
3000                 // Get the MHT file input stream.
3001                 InputStream mhtFileInputStream = getContentResolver().openInputStream(Uri.parse(openFilePath));
3002
3003                 // Create a temporary MHT file.
3004                 File temporaryMhtFile = File.createTempFile("temporary_mht_file", ".mht", getCacheDir());
3005
3006                 // Get a file output stream for the temporary MHT file.
3007                 FileOutputStream temporaryMhtFileOutputStream = new FileOutputStream(temporaryMhtFile);
3008
3009                 // Create a transfer byte array.
3010                 byte[] transferByteArray = new byte[1024];
3011
3012                 // Create an integer to track the number of bytes read.
3013                 int bytesRead;
3014
3015                 // Copy the temporary MHT file input stream to the MHT output stream.
3016                 while ((bytesRead = mhtFileInputStream.read(transferByteArray)) > 0) {
3017                     temporaryMhtFileOutputStream.write(transferByteArray, 0, bytesRead);
3018                 }
3019
3020                 // Flush the temporary MHT file output stream.
3021                 temporaryMhtFileOutputStream.flush();
3022
3023                 // Close the streams.
3024                 temporaryMhtFileOutputS